Efficient transit light curves for oblate and rapidly rotating stars Article Swipe
Shashank Dholakia
,
Rodrigo Luger
,
Shishir Dholakia
·
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.5281/zenodo.5131524
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.5281/zenodo.5131524
Exoplanets that transit rapidly-rotating stars can be a unique tool to learn about the dynamical history of exoplanet systems photometrically. Two rotational effects on such stars are oblateness and gravity darkening, where the poles are hotter and more luminous than the equator due to latitude-dependent stellar surface gravity. Both of these effects break spherical symmetry and can allow a photometric measurement of the true spin-orbit angle of the system. We create a fast, semi-analytic transit model in the starry package that incorporate these effects. We model gravity darkening using a spherical harmonic expansion of the Von Zeipel Law to arbitrary order. We take into account stellar oblateness by modeling the star as an ellipse in projection. Using Green’s theorem, we write the 2D flux integral as an equivalent 1D integral around the projected boundary of the star and planet. The implementation in starry is 4 orders of magnitude faster and more precise than equivalent numerical methods and well suited to posterior inference. We note its use as a complement to spectroscopic measurements that provide the projected spin-orbit angle and also as a standalone method to constrain spin-orbit angles photometrically for hundreds of such systems in TESS.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- http://ui.adsabs.harvard.edu/abs/2021tsc2.confE.177D/abstract
- OA Status
- green
- Related Works
- 20
- OpenAlex ID
- https://openalex.org/W3212538826
All OpenAlex metadata
Raw OpenAlex JSON
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https://openalex.org/W3212538826Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.5281/zenodo.5131524Digital Object Identifier
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Efficient transit light curves for oblate and rapidly rotating starsWork title
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articleOpenAlex work type
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enPrimary language
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2021Year of publication
- Publication date
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2021-07-23Full publication date if available
- Authors
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Shashank Dholakia, Rodrigo Luger, Shishir DholakiaList of authors in order
- Landing page
-
https://ui.adsabs.harvard.edu/abs/2021tsc2.confE.177D/abstractPublisher landing page
- Open access
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YesWhether a free full text is available
- OA status
-
greenOpen access status per OpenAlex
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https://doi.org/10.5281/zenodo.5131524Direct OA link when available
- Concepts
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Stars, Light curve, Physics, Oblate spheroid, Transit (satellite), Astronomy, Geometry, Classical mechanics, Mathematics, Engineering, Transport engineering, Public transportTop concepts (fields/topics) attached by OpenAlex
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0Total citation count in OpenAlex
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20Other works algorithmically related by OpenAlex
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