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

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DOI

  • John P. Ahlers, NASA Goddard Space Flight Center
  • ,
  • Ethan Kruse, NASA Goddard Space Flight Center
  • ,
  • Knicole D. Colón, NASA Goddard Space Flight Center
  • ,
  • Patrick Dorval, Leiden University, ASTRON
  • ,
  • Geert Jan Talens, HEC Montréal (Université de Montréal)
  • ,
  • Ignas Snellen, Leiden University
  • ,
  • Simon Albrecht
  • Gilles Otten, CNRS
  • ,
  • George Ricker, Massachusetts Institute of Technology
  • ,
  • Roland Vanderspek, Massachusetts Institute of Technology
  • ,
  • David Latham, Harvard-Smithsonian Center for Astrophysics
  • ,
  • Sara Seager, Massachusetts Institute of Technology
  • ,
  • Joshua Winn, Princeton University, Princeton, NJ
  • ,
  • Jon M. Jenkins, NASA Ames Research Center
  • ,
  • Kari Haworth, Massachusetts Institute of Technology
  • ,
  • Scott Cartwright, Proto-Logic LLC
  • ,
  • Robert Morris, NASA Ames Research Center, SETI Institute
  • ,
  • Pam Rowden, Open University Milton Keynes
  • ,
  • Peter Tenenbaum, NASA Ames Research Center, SETI Institute
  • ,
  • Eric B. Ting, NASA Ames Research Center

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 ∼4σ 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.

OriginalsprogEngelsk
Artikelnummer63
TidsskriftAstrophysical Journal
Vol/bind888
Nummer2
Antal sider9
ISSN0004-637X
DOI
StatusUdgivet - 2020

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