Occulted Active Regions – NASA ExoPAG 2021

Presented by Brett Morris, prepared by Mahmoud Oshagh and Brett Morris on behalf of ExoPAG SAG 21 Subgroup 3.

https://arxiv.org/abs/2201.09905

Transcript

1. Occulted Active Regions Mahmoud Oshagh Brett Morris On behalf of SAG21 Subgroup 3
2. ...there are ways of approach to unknown territory which lead surprisingly far, and repay their followers richly. There is probably no better example of this than eclipses of heavenly bodies. —Henry Norris Russell (1948) via Joshua Winn (2010)
3. What do we measure from AR occultations? Measured: • AR radii/contrasts (degenerate) • AR positions relative to transit chord (degenerate) • Number of ARs in transit chord Desired but not measured: • AR physical dimensions • Precise AR positions in stellar coordinates • Total spot coverage
4. Unocculted ARs suffer many degeneracies → AR occultations break degeneracies Morris et al. 2017 HAT-P-11
5. CoRoT-2 was continuously monitored over approximately 140 days by the CoRoT space telescope. Nutzman et al. 2011 CoRoT: CoRoT-2
6. Kepler: Kepler-17 Désert et al 2011
7. Kepler+RM: HAT-P-11 Sanchis-Ojeda & Winn (2011)
8. Kepler: HAT-P-11 Oshagh et al. 2012
9. Bibliography of public spot occultation codes KSINT: http://eduscisoft.com/KSINT/index.php SOAP-T: http://www.astro.up.pt/resources/soap-t/ Spotrod: https://github.com/bencebeky/spotrod Starry: https://github.com/rodluger/starry Starsim2: https://github.com/rosich/Starsim-2 STSP: https://github.com/lesliehebb/stsp PyTranSpot: https://arxiv.org/abs/1710.11209 TOSC: https://arxiv.org/abs/1707.01153
10. Effects of occulted ARs on transmission spectroscopy
11. Hubble/STIS: HD 189733 Sing+2011
12. Sing+2011 Sing+2011 Hubble/STIS: HD 189733 Upcoming talk: Observing planet-starspot crossings with the James Webb Space Telescope Giovanni Bruno (INAF)
13. HD 189733 b Oshagh+2014
14. Magellan/IMACS: WASP-19 Espinoza+2018
15. Izaña Observatory/STELLA: HAT-P-11 Chachan et al. 2019
16. HST/STIS+HST/WFC3+Spitzer: HAT-P-11 Chachan et al. 2019
17. Some Open Questions Which additional (photometric, spectroscopic, polarimetric) observations would help constrain the occulted AR properties? Can we compare hot/cool stellar spectral templates with spectroscopic ab initio models? How do our high S/N observations in broad bandpasses translate to lower S/N inferences in narrow spectral ranges?
18. Occulted Active Regions (ARs), the Game™
19. Occulted Active Regions (ARs), the Game™
20. Occulted Active Regions (ARs), the Game™
21. Occulted Active Regions (ARs), the Game™
22. Map of upcoming talks Upcoming talk: Using multi-band photometry to model and correct stellar activity effects in transmission spectroscopy Ignasi Ribas (Institute of Space Sciences (ICE, CSIC) & IEEC) Upcoming talk: Disentangling the effect of stellar contamination on optical transmission spectra from multi epoch ground based spectrophotometric observations and constraints from TESS Vatsal Panwar (University of Amsterdam) Upcoming talk: Stellar Decomposition Using Out of Transit Transmission Spectral Data Chima McGruder (Harvard University) Upcoming talk: On the fraction of variable host stars among the known hot Jupiters Matthias Mallonn (Leibniz Institute for Astrophysics Potsdam) Upcoming talk: Observing planet-starspot crossings with the James Webb Space Telescope Giovanni Bruno (INAF)