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The effect of stellar activity on the detection of terrestrial planets
Stars undergo activity cycles often lasting many years. During these periods surface phenomena on their surfaces may not only make exoplanet planet detection and characterisation difficult but, in some cases, may produce spurious signals that mimic those expected from exoplanet mass companions. Here we look at the menagerie of processes occurring and look at ways to minimize their effects. Further developments will be needed if we are to reach sufficient accuracy to detect earth analogue systems or to reveal atmospheres of small planets.
We also had the Sky in September.
Chapters
00:05:06 Main talk
01:12:30 The Sky in September
published: 04 Sep 2021
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Asteroseismic Signatures of Stellar Activity Cycles
A scientific presentation given by Travis Metcalfe at the Kavli Institute for Theoretical Physics, University of California at Santa Barbara, 6 October 2011.
published: 07 Oct 2011
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SOAP 2.0: RV stellar activity simulation including spot and faculae
X. Dumusque, I. Boisse, N.Santos
SOAP 2.0 allows to model the RV effect (and the effect on the FWHM, CONTRAST and BIS SPAN of the CCF) induced by magnetic regions (spot and faculae) on the surface of a star. The temperature of the magnetic features, their size, their location on the stellar surface, the resolution of the instrument used, the stellar properties (radius, effective temperature, inclination), are all parameters that can be adjusted. The code is efficient, as all the backend computation are performed in C, and is friendly to use as the interface is in python.
Code Language(s): C, Python2
For more check out the EMAC site or follow us on twitter!
EMAC Tool link: https://emac.gsfc.nasa.gov?cid=2207-016
Twitter: https://twitter.com/ExoplanetModels
RSS: https://emac.gsfc.nasa.g...
published: 26 Jul 2022
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Stellar Activity (Original Mix)
Provided to YouTube by DANCE ALL DAY Musicvertriebs GmbH
Stellar Activity (Original Mix) · Dj Marvel, Alfonso Forte
Dogma Party Vol.2
℗ 2012 Substudio Records
Released on: 2012-12-12
Auto-generated by YouTube.
published: 09 Nov 2014
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Using multi-band photometry to model and correct stellar activity effects in transmission spectra
Ignasi Ribas (Institute of Space Sciences (ICE, CSIC) & IEEC)
Abstract: We have developed a method to derive the surface distribution and properties of stellar active regions by modelling multi-wavelength time-series observables. Our StarSim code has the capability to solve the inverse problem and derive the properties of the stars and their active regions by fitting photometric data. As a test case, we analyzed ∼600 days of BVRI multi-band photometry of the K2 V exoplanet host star WASP-52. We were able to determine the relevant activity parameters and reconstruct the time-evolving longitudinal map of active regions. The star shows a heterogeneous surface composed of dark spots with a mean temperature of 575 ± 150 K lower than the photospheric value, with filling factors ranging from 3 t...
published: 18 Mar 2021
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PLANETARY HABITABILITY: LIMITATIONS AND TIMESCALES RELATED TO STELLAR MAGNETIC ACTIVITY
ASTROBIOLOGY 2017 by Gustavo Porto de Mello
published: 16 Dec 2017
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Role of magnetospheres in planetary atmospheres and the connection to stellar activity evolution
published: 22 Jun 2021
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THE ENIGMATIC CORRELATION BETWEEN STELLAR ACTIVITY AND PLANETARY SURFACE GRAVITY
By - PEDRO FIGUEIRA - The enigmatic correlation between stellar activity and planetary surface gravity - Habitability in the Universe: From the Early Earth to Exoplanets - 22-27 March 2015, Porto, Portugal
published: 09 Apr 2015
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Scientists capture satellite image of "cornal hole" near sun's equator
The hole means "high-speed solar wind is flowing our way, which could result in geomagnetic storm activity two or three nights from Friday, March 22.
published: 22 Mar 2024
-
Illinois Astronomy Colloquium: Stellar Activity in the Time Domain - Dr. Ben Montet
Speaker: Dr. Ben Montet, University of New South Wales
Abstract: The NASA Kepler and TESS missions have opened up a new window into the variability of stars on timescales ranging from seconds to years. By observing millions of stars, data from these missions have enabled us to develop data-driven methods to understand starspots and flares, magnetic activity cycles, and interactions between young stars and their protoplanetary disks. In this seminar, I will highlight how these data have enhanced our understanding of stellar activity and its implications towards planetary habitability, as well as our ability to observe long-predicted magnetic interactions between stars and their circumstellar material. I will also discuss major outstanding questions that may be solved over the coming years ...
published: 13 Dec 2021
1:47:36
The effect of stellar activity on the detection of terrestrial planets
Stars undergo activity cycles often lasting many years. During these periods surface phenomena on their surfaces may not only make exoplanet planet detection an...
Stars undergo activity cycles often lasting many years. During these periods surface phenomena on their surfaces may not only make exoplanet planet detection and characterisation difficult but, in some cases, may produce spurious signals that mimic those expected from exoplanet mass companions. Here we look at the menagerie of processes occurring and look at ways to minimize their effects. Further developments will be needed if we are to reach sufficient accuracy to detect earth analogue systems or to reveal atmospheres of small planets.
We also had the Sky in September.
Chapters
00:05:06 Main talk
01:12:30 The Sky in September
https://wn.com/The_Effect_Of_Stellar_Activity_On_The_Detection_Of_Terrestrial_Planets
Stars undergo activity cycles often lasting many years. During these periods surface phenomena on their surfaces may not only make exoplanet planet detection and characterisation difficult but, in some cases, may produce spurious signals that mimic those expected from exoplanet mass companions. Here we look at the menagerie of processes occurring and look at ways to minimize their effects. Further developments will be needed if we are to reach sufficient accuracy to detect earth analogue systems or to reveal atmospheres of small planets.
We also had the Sky in September.
Chapters
00:05:06 Main talk
01:12:30 The Sky in September
- published: 04 Sep 2021
- views: 561
37:36
Asteroseismic Signatures of Stellar Activity Cycles
A scientific presentation given by Travis Metcalfe at the Kavli Institute for Theoretical Physics, University of California at Santa Barbara, 6 October 2011.
A scientific presentation given by Travis Metcalfe at the Kavli Institute for Theoretical Physics, University of California at Santa Barbara, 6 October 2011.
https://wn.com/Asteroseismic_Signatures_Of_Stellar_Activity_Cycles
A scientific presentation given by Travis Metcalfe at the Kavli Institute for Theoretical Physics, University of California at Santa Barbara, 6 October 2011.
- published: 07 Oct 2011
- views: 172
2:34
SOAP 2.0: RV stellar activity simulation including spot and faculae
X. Dumusque, I. Boisse, N.Santos
SOAP 2.0 allows to model the RV effect (and the effect on the FWHM, CONTRAST and BIS SPAN of the CCF) induced by magnetic reg...
X. Dumusque, I. Boisse, N.Santos
SOAP 2.0 allows to model the RV effect (and the effect on the FWHM, CONTRAST and BIS SPAN of the CCF) induced by magnetic regions (spot and faculae) on the surface of a star. The temperature of the magnetic features, their size, their location on the stellar surface, the resolution of the instrument used, the stellar properties (radius, effective temperature, inclination), are all parameters that can be adjusted. The code is efficient, as all the backend computation are performed in C, and is friendly to use as the interface is in python.
Code Language(s): C, Python2
For more check out the EMAC site or follow us on twitter!
EMAC Tool link: https://emac.gsfc.nasa.gov?cid=2207-016
Twitter: https://twitter.com/ExoplanetModels
RSS: https://emac.gsfc.nasa.gov/news/
https://wn.com/Soap_2.0_Rv_Stellar_Activity_Simulation_Including_Spot_And_Faculae
X. Dumusque, I. Boisse, N.Santos
SOAP 2.0 allows to model the RV effect (and the effect on the FWHM, CONTRAST and BIS SPAN of the CCF) induced by magnetic regions (spot and faculae) on the surface of a star. The temperature of the magnetic features, their size, their location on the stellar surface, the resolution of the instrument used, the stellar properties (radius, effective temperature, inclination), are all parameters that can be adjusted. The code is efficient, as all the backend computation are performed in C, and is friendly to use as the interface is in python.
Code Language(s): C, Python2
For more check out the EMAC site or follow us on twitter!
EMAC Tool link: https://emac.gsfc.nasa.gov?cid=2207-016
Twitter: https://twitter.com/ExoplanetModels
RSS: https://emac.gsfc.nasa.gov/news/
- published: 26 Jul 2022
- views: 51
7:38
Stellar Activity (Original Mix)
Provided to YouTube by DANCE ALL DAY Musicvertriebs GmbH
Stellar Activity (Original Mix) · Dj Marvel, Alfonso Forte
Dogma Party Vol.2
℗ 2012 Substudio Record...
Provided to YouTube by DANCE ALL DAY Musicvertriebs GmbH
Stellar Activity (Original Mix) · Dj Marvel, Alfonso Forte
Dogma Party Vol.2
℗ 2012 Substudio Records
Released on: 2012-12-12
Auto-generated by YouTube.
https://wn.com/Stellar_Activity_(Original_Mix)
Provided to YouTube by DANCE ALL DAY Musicvertriebs GmbH
Stellar Activity (Original Mix) · Dj Marvel, Alfonso Forte
Dogma Party Vol.2
℗ 2012 Substudio Records
Released on: 2012-12-12
Auto-generated by YouTube.
- published: 09 Nov 2014
- views: 16
13:14
Using multi-band photometry to model and correct stellar activity effects in transmission spectra
Ignasi Ribas (Institute of Space Sciences (ICE, CSIC) & IEEC)
Abstract: We have developed a method to derive the surface distribution and properties of stellar...
Ignasi Ribas (Institute of Space Sciences (ICE, CSIC) & IEEC)
Abstract: We have developed a method to derive the surface distribution and properties of stellar active regions by modelling multi-wavelength time-series observables. Our StarSim code has the capability to solve the inverse problem and derive the properties of the stars and their active regions by fitting photometric data. As a test case, we analyzed ∼600 days of BVRI multi-band photometry of the K2 V exoplanet host star WASP-52. We were able to determine the relevant activity parameters and reconstruct the time-evolving longitudinal map of active regions. The star shows a heterogeneous surface composed of dark spots with a mean temperature of 575 ± 150 K lower than the photospheric value, with filling factors ranging from 3 to 14%. We used the results to study the chromatic effects on the depth of exoplanet transits obtained at different epochs and corresponding to different stellar spot distributions. From peak-to-peak photometric variations of ∼7% in the visible, the residual effects of unocculted dark spots on the measured transit depth of the giant planet WASP-52 b are about 10^−4 at 550 nm and 3×10^−5 at 6 μm. Our findings demonstrate that it is possible to reconstruct the parameters and distribution of active regions over time by using contemporaneous ground-based multi-band photometry of an active star. This makes it possible to quantify the effects from unocculted star spots on the planetary radius measured from transit spectroscopy and mitigate them by about an order of magnitude.
https://wn.com/Using_Multi_Band_Photometry_To_Model_And_Correct_Stellar_Activity_Effects_In_Transmission_Spectra
Ignasi Ribas (Institute of Space Sciences (ICE, CSIC) & IEEC)
Abstract: We have developed a method to derive the surface distribution and properties of stellar active regions by modelling multi-wavelength time-series observables. Our StarSim code has the capability to solve the inverse problem and derive the properties of the stars and their active regions by fitting photometric data. As a test case, we analyzed ∼600 days of BVRI multi-band photometry of the K2 V exoplanet host star WASP-52. We were able to determine the relevant activity parameters and reconstruct the time-evolving longitudinal map of active regions. The star shows a heterogeneous surface composed of dark spots with a mean temperature of 575 ± 150 K lower than the photospheric value, with filling factors ranging from 3 to 14%. We used the results to study the chromatic effects on the depth of exoplanet transits obtained at different epochs and corresponding to different stellar spot distributions. From peak-to-peak photometric variations of ∼7% in the visible, the residual effects of unocculted dark spots on the measured transit depth of the giant planet WASP-52 b are about 10^−4 at 550 nm and 3×10^−5 at 6 μm. Our findings demonstrate that it is possible to reconstruct the parameters and distribution of active regions over time by using contemporaneous ground-based multi-band photometry of an active star. This makes it possible to quantify the effects from unocculted star spots on the planetary radius measured from transit spectroscopy and mitigate them by about an order of magnitude.
- published: 18 Mar 2021
- views: 73
8:56
THE ENIGMATIC CORRELATION BETWEEN STELLAR ACTIVITY AND PLANETARY SURFACE GRAVITY
By - PEDRO FIGUEIRA - The enigmatic correlation between stellar activity and planetary surface gravity - Habitability in the Universe: From the Early Earth to E...
By - PEDRO FIGUEIRA - The enigmatic correlation between stellar activity and planetary surface gravity - Habitability in the Universe: From the Early Earth to Exoplanets - 22-27 March 2015, Porto, Portugal
https://wn.com/The_Enigmatic_Correlation_Between_Stellar_Activity_And_Planetary_Surface_Gravity
By - PEDRO FIGUEIRA - The enigmatic correlation between stellar activity and planetary surface gravity - Habitability in the Universe: From the Early Earth to Exoplanets - 22-27 March 2015, Porto, Portugal
- published: 09 Apr 2015
- views: 130
0:35
Scientists capture satellite image of "cornal hole" near sun's equator
The hole means "high-speed solar wind is flowing our way, which could result in geomagnetic storm activity two or three nights from Friday, March 22.
The hole means "high-speed solar wind is flowing our way, which could result in geomagnetic storm activity two or three nights from Friday, March 22.
https://wn.com/Scientists_Capture_Satellite_Image_Of_Cornal_Hole_Near_Sun's_Equator
The hole means "high-speed solar wind is flowing our way, which could result in geomagnetic storm activity two or three nights from Friday, March 22.
- published: 22 Mar 2024
- views: 431
1:11:30
Illinois Astronomy Colloquium: Stellar Activity in the Time Domain - Dr. Ben Montet
Speaker: Dr. Ben Montet, University of New South Wales
Abstract: The NASA Kepler and TESS missions have opened up a new window into the variability of stars on...
Speaker: Dr. Ben Montet, University of New South Wales
Abstract: The NASA Kepler and TESS missions have opened up a new window into the variability of stars on timescales ranging from seconds to years. By observing millions of stars, data from these missions have enabled us to develop data-driven methods to understand starspots and flares, magnetic activity cycles, and interactions between young stars and their protoplanetary disks. In this seminar, I will highlight how these data have enhanced our understanding of stellar activity and its implications towards planetary habitability, as well as our ability to observe long-predicted magnetic interactions between stars and their circumstellar material. I will also discuss major outstanding questions that may be solved over the coming years with future surveys like the Rubin Legacy Survey of Space and Time and the Nancy Grace Roman wide-field survey of the Galactic bulge.
Date: November 9, 2021
https://wn.com/Illinois_Astronomy_Colloquium_Stellar_Activity_In_The_Time_Domain_Dr._Ben_Montet
Speaker: Dr. Ben Montet, University of New South Wales
Abstract: The NASA Kepler and TESS missions have opened up a new window into the variability of stars on timescales ranging from seconds to years. By observing millions of stars, data from these missions have enabled us to develop data-driven methods to understand starspots and flares, magnetic activity cycles, and interactions between young stars and their protoplanetary disks. In this seminar, I will highlight how these data have enhanced our understanding of stellar activity and its implications towards planetary habitability, as well as our ability to observe long-predicted magnetic interactions between stars and their circumstellar material. I will also discuss major outstanding questions that may be solved over the coming years with future surveys like the Rubin Legacy Survey of Space and Time and the Nancy Grace Roman wide-field survey of the Galactic bulge.
Date: November 9, 2021
- published: 13 Dec 2021
- views: 38