Mass determinations of the three mini-Neptunes transiting TOI-125
(2020) In Monthly Notices of the Royal Astronomical Society 492(4). p.5399-5412- Abstract
The Transiting Exoplanet Survey Satellite, TESS, is currently carrying out an all-sky search for small planets transiting bright stars. In the first year of the TESS survey, a steady progress was made in achieving the mission's primary science goal of establishing bulk densities for 50 planets smaller than Neptune. During that year, the TESS's observations were focused on the southern ecliptic hemisphere, resulting in the discovery of three mini-Neptunes orbiting the star TOI-125, a V = 11.0 K0 dwarf. We present intensive HARPS radial velocity observations, yielding precise mass measurements for TOI-125b, TOI-125c, and TOI-125d. TOI-125b has an orbital period of 4.65 d, a radius of 2.726 ± 0.075 RE, a mass of 9.50 ± 0.88 ME, and is near... (More)
The Transiting Exoplanet Survey Satellite, TESS, is currently carrying out an all-sky search for small planets transiting bright stars. In the first year of the TESS survey, a steady progress was made in achieving the mission's primary science goal of establishing bulk densities for 50 planets smaller than Neptune. During that year, the TESS's observations were focused on the southern ecliptic hemisphere, resulting in the discovery of three mini-Neptunes orbiting the star TOI-125, a V = 11.0 K0 dwarf. We present intensive HARPS radial velocity observations, yielding precise mass measurements for TOI-125b, TOI-125c, and TOI-125d. TOI-125b has an orbital period of 4.65 d, a radius of 2.726 ± 0.075 RE, a mass of 9.50 ± 0.88 ME, and is near the 2:1 mean motion resonance with TOI-125c at 9.15 d. TOI-125c has a similar radius of 2.759 ± 0.10 RE and a mass of 6.63 ± 0.99 ME, being the puffiest of the three planets. TOI-125d has an orbital period of 19.98 d and a radius of 2.93 ± 0.17 RE and mass 13.6 ± 1.2 ME. For TOI-125b and d, we find unusual high eccentricities of 0.19 ± 0.04 and 0.17+0.08-0.06, respectively. Our analysis also provides upper mass limits for the two low-SNR planet candidates in the system; for TOI-125.04 (RP = 1.36 RE, P = 0.53 d), we find a 2ó upper mass limit of 1.6 ME, whereas TOI-125.05 (RP = 4.2+2.4-1.4 RE, P = 13.28 d) is unlikely a viable planet candidate with an upper mass limit of 2.7 ME. We discuss the internal structure of the three confirmed planets, as well as dynamical stability and system architecture for this intriguing exoplanet system.
(Less)
- author
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- keywords
- Planets and satellites: detection, Planets and satellites: individual: (TOI-125, TIC 52368076)
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 492
- issue
- 4
- pages
- 14 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85088584988
- ISSN
- 0035-8711
- DOI
- 10.1093/MNRAS/STAA197
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2020 The Author(s).
- id
- 7dd3e071-838f-4b2b-ae48-b17d8704881a
- date added to LUP
- 2023-02-02 09:29:26
- date last changed
- 2023-02-21 11:22:04
@article{7dd3e071-838f-4b2b-ae48-b17d8704881a,
abstract = {{<p>The Transiting Exoplanet Survey Satellite, TESS, is currently carrying out an all-sky search for small planets transiting bright stars. In the first year of the TESS survey, a steady progress was made in achieving the mission's primary science goal of establishing bulk densities for 50 planets smaller than Neptune. During that year, the TESS's observations were focused on the southern ecliptic hemisphere, resulting in the discovery of three mini-Neptunes orbiting the star TOI-125, a V = 11.0 K0 dwarf. We present intensive HARPS radial velocity observations, yielding precise mass measurements for TOI-125b, TOI-125c, and TOI-125d. TOI-125b has an orbital period of 4.65 d, a radius of 2.726 ± 0.075 RE, a mass of 9.50 ± 0.88 ME, and is near the 2:1 mean motion resonance with TOI-125c at 9.15 d. TOI-125c has a similar radius of 2.759 ± 0.10 RE and a mass of 6.63 ± 0.99 ME, being the puffiest of the three planets. TOI-125d has an orbital period of 19.98 d and a radius of 2.93 ± 0.17 RE and mass 13.6 ± 1.2 ME. For TOI-125b and d, we find unusual high eccentricities of 0.19 ± 0.04 and 0.17+0.08-0.06, respectively. Our analysis also provides upper mass limits for the two low-SNR planet candidates in the system; for TOI-125.04 (RP = 1.36 RE, P = 0.53 d), we find a 2ó upper mass limit of 1.6 ME, whereas TOI-125.05 (RP = 4.2+2.4-1.4 RE, P = 13.28 d) is unlikely a viable planet candidate with an upper mass limit of 2.7 ME. We discuss the internal structure of the three confirmed planets, as well as dynamical stability and system architecture for this intriguing exoplanet system.</p>}},
author = {{Nielsen, L. D. and Gandolfi, D. and Armstrong, D. J. and Jenkins, J. S. and Fridlund, M. and Santos, N. C. and Dai, F. and Adibekyan, V. and Luque, R. and Steffen, J. H. and Esposito, M. and Meru, F. and Sabotta, S. and Bolmont, E. and Kossakowski, D. and Otegi, J. F. and Murgas, F. and Stalport, M. and Rodler, F. and Diáz, M. R. and Kurtovic, N. T. and Ricker, G. and Vanderspek, R. and Latham, D. W. and Seager, S. and Winn, J. N. and Jenkins, J. M. and Allart, R. and Almenara, J. M. and Barrado, D. and Barros, S. C.C. and Bayliss, D. and Berdiñas, Z. M. and Boisse, I. and Bouchy, F. and Boyd, P. and Brown, D. J.A. and Bryant, E. M. and Burke, C. and Cochran, W. D. and Cooke, B. F. and Demangeon, O. D.S. and Diáz, R. F. and Dittman, J. and Dorn, C. and Dumusque, X. and Garciá, R. A. and Gonzaĺez-Cuesta, L. and Grziwa, S. and Georgieva, I. and Guerrero, N. and Hatzes, A. P. and Helled, R. and Henze, C. E. and Hojjatpanah, S. and Korth, J. and Lam, K. W.F. and Lillo-Box, J. and Lopez, T. A. and Livingston, J. and Mathur, S. and Mousis, O. and Narita, N. and Osborn, H. P. and Palle, E. and Peña Rojas, P. A. and Persson, C. M. and Quinn, S. N. and Rauer, H. and Redfield, S. and Santerne, A. and Dos Santos, L. A. and Seidel, J. V. and Sousa, S. G. and Ting, E. B. and Turbet, M. and Udry, S. and Vanderburg, A. and Van Eylen, V. and Vines, J. I. and Wheatley, P. J. and Wilson, P. A.}},
issn = {{0035-8711}},
keywords = {{Planets and satellites: detection; Planets and satellites: individual: (TOI-125, TIC 52368076)}},
language = {{eng}},
number = {{4}},
pages = {{5399--5412}},
publisher = {{Oxford University Press}},
series = {{Monthly Notices of the Royal Astronomical Society}},
title = {{Mass determinations of the three mini-Neptunes transiting TOI-125}},
url = {{http://dx.doi.org/10.1093/MNRAS/STAA197}},
doi = {{10.1093/MNRAS/STAA197}},
volume = {{492}},
year = {{2020}},
}