Hawthorn, Faith;
Bayliss, Daniel;
Wilson, Thomas G;
Bonfanti, Andrea;
Adibekyan, Vardan;
Alibert, Yann;
Sousa, Sérgio G;
... Zhang, Hui; + view all
(2023)
TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf.
Monthly Notices of the Royal Astronomical Society
, 520
(3)
pp. 3649-3668.
10.1093/mnras/stad306.
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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.
| Type: | Article |
|---|---|
| Title: | TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stad306 |
| Publisher version: | https://doi.org/10.1093/mnras/stad306 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | techniques: photometric, techniques: radial velocities, planets and satellites: detection, stars: individual: TOI-836 (TIC 440887364, GAIA EDR3 6230733559097425152) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10169647 |
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