Document Type
Article
Publication Date
4-1-2023
Published In
Monthly Notices Of The Royal Astronomical Society
Abstract
We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright (T = 8.5 mag), high proper motion (∼200 mas yr⁻¹), low metallicity ([Fe/H]≈−0.28) K-dwarf with a mass of 0.68 ± 0.05 M⊙ and a radius of 0.67 ± 0.01 R⊙. We obtain photometric follow-up observations with a variety of facilities, and we use these data sets to determine that the inner planet, TOI-836 b, is a 1.70 ± 0.07 R⊕ super-Earth in a 3.82-d orbit, placing it directly within the so-called ‘radius valley’. The outer planet, TOI-836 c, is a 2.59 ± 0.09 R⊕ mini-Neptune in an 8.60-d orbit. Radial velocity measurements reveal that TOI-836 b has a mass of 4.5 ± 0.9 M⊕, while TOI-836 c has a mass of 9.6 ± 2.6 M⊕. Photometric observations show Transit Timing Variations (TTVs) on the order of 20 min for TOI-836 c, although there are no detectable TTVs for TOI-836 b. The TTVs of planet TOI-836 c may be caused by an undetected exterior planet.
Recommended Citation
F. Hawthorn et al.
(2023).
"TOI-836: A Super-Earth And Mini-Neptune Transiting A Nearby K-Dwarf".
Monthly Notices Of The Royal Astronomical Society.
Volume 520,
Issue 3.
3649-3668.
DOI: 10.1093/mnras/stad306
https://works.swarthmore.edu/fac-physics/499
Comments
This article has been published in Monthly Notices Of The Royal Astronomical Society. © 2023 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.