TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf
(2023) In Monthly Notices of the Royal Astronomical Society 520(3). p.3649-3668- 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... (More)
- 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. © 2023 Oxford University Press. All rights reserved. (Less)
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https://lup.lub.lu.se/record/e2cd1482-559f-4441-a5c4-1b7f1288c516
- author
- Hawthorn, F. ; Davies, M.B. LU and Zhang, H.
- author collaboration
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- planets and satellites: detection, stars: individual: TOI-836 (TIC 440887364, GAIA EDR3 6230733559097425152), techniques: photometric, techniques: radial velocities, Earth (planet), Photometry, Planets, Satellites, Exo-planets, Neptune, Photometrics, Planets and satellites: detections, Star: individual: TOI-836 (TIC 440887364, GAIA EDR3 6230733559097425152), Stars: individual: proxima Centauri, Techniques: photometric, Techniques: radial velocities, Timing variations, Transit timing, Orbits
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 520
- issue
- 3
- pages
- 20 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85159304875
- ISSN
- 0035-8711
- DOI
- 10.1093/mnras/stad306
- language
- English
- LU publication?
- yes
- id
- e2cd1482-559f-4441-a5c4-1b7f1288c516
- date added to LUP
- 2023-11-06 16:01:34
- date last changed
- 2023-11-06 16:01:34
@article{e2cd1482-559f-4441-a5c4-1b7f1288c516,
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. © 2023 Oxford University Press. All rights reserved.}},
author = {{Hawthorn, F. and Davies, M.B. and Zhang, H.}},
issn = {{0035-8711}},
keywords = {{planets and satellites: detection; stars: individual: TOI-836 (TIC 440887364, GAIA EDR3 6230733559097425152); techniques: photometric; techniques: radial velocities; Earth (planet); Photometry; Planets; Satellites; Exo-planets; Neptune; Photometrics; Planets and satellites: detections; Star: individual: TOI-836 (TIC 440887364, GAIA EDR3 6230733559097425152); Stars: individual: proxima Centauri; Techniques: photometric; Techniques: radial velocities; Timing variations; Transit timing; Orbits}},
language = {{eng}},
number = {{3}},
pages = {{3649--3668}},
publisher = {{Oxford University Press}},
series = {{Monthly Notices of the Royal Astronomical Society}},
title = {{TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf}},
url = {{http://dx.doi.org/10.1093/mnras/stad306}},
doi = {{10.1093/mnras/stad306}},
volume = {{520}},
year = {{2023}},
}