Details

Autor(en) / Beteiligte

• Ahlers, John P.
• Kruse, Ethan
• Colón, Knicole D.
• Dorval, Patrick
• Talens, Geert Jan
• Snellen, Ignas
• Albrecht, Simon
• Otten, Gilles
• Ricker, George
• Vanderspek, Roland
• Latham, David
• Seager, Sara
• Winn, Joshua
• Jenkins, Jon M.
• Haworth, Kari
• Cartwright, Scott
• Morris, Robert
• Rowden, Pam
• Tenenbaum, Peter
• Ting, Eric B.

Titel

Gravity-darkening Analysis of the Misaligned Hot Jupiter MASCARA-4 b

Ist Teil von

• The Astrophysical journal, 2020-01, Vol.888 (2), p.63

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2020

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• MASCARA-4 b is a hot Jupiter in a highly misaligned orbit around a rapidly rotating A3V star that was observed for 54 days by the Transiting Exoplanet Survey Satellite (TESS). We perform two analyses of MASCARA-4 b using a stellar gravity-darkened model. First, we measure MASCARA-4 b's misaligned orbital configuration by modeling its TESS photometric light curve. We take advantage of the asymmetry in MASCARA-4 b's transit due to its host star's gravity-darkened surface to measure MASCARA-4 b's true spin-orbit angle to be 104° . We also detect a ∼4 secondary eclipse at 0.491 0.007 orbital phase, proving that the orbit is slightly eccentric. Second, we model MASCARA-4 b's insolation including gravity darkening and find that the planet's received X-ray and ultraviolet flux varies by 4% throughout its orbit. MASCARA-4 b's short-period, polar orbit suggests that the planet likely underwent dramatic orbital evolution to end up in its present-day configuration and that it receives a varying stellar irradiance that perpetually forces the planet out of thermal equilibrium. These findings make MASCARA-4 b an excellent target for follow-up characterization to better understand the orbital evolution and present-day environment of planets around high-mass stars.