The TOI-763 system : Sub-Neptunes orbiting a Sun-like star
(2020) In Monthly Notices of the Royal Astronomical Society 498(3). p.4503-4517- Abstract
We report the discovery of a planetary system orbiting TOI-763(aka CD-39 7945), a V = 10.2, high proper motion G-type dwarf star that was photometrically monitored by the TESS space mission in Sector 10. We obtain and model the stellar spectrum and find an object slightly smaller than the Sun, and somewhat older, but with a similar metallicity. Two planet candidates were found in the light curve to be transiting the star. Combining TESS transit photometry with HARPS high-precision radial velocity (RV) follow-up measurements confirm the planetary nature of these transit signals. We determine masses, radii, and bulk densities of these two planets. A third planet candidate was discovered serendipitously in the RV data. The inner transiting... (More)
We report the discovery of a planetary system orbiting TOI-763(aka CD-39 7945), a V = 10.2, high proper motion G-type dwarf star that was photometrically monitored by the TESS space mission in Sector 10. We obtain and model the stellar spectrum and find an object slightly smaller than the Sun, and somewhat older, but with a similar metallicity. Two planet candidates were found in the light curve to be transiting the star. Combining TESS transit photometry with HARPS high-precision radial velocity (RV) follow-up measurements confirm the planetary nature of these transit signals. We determine masses, radii, and bulk densities of these two planets. A third planet candidate was discovered serendipitously in the RV data. The inner transiting planet, TOI-763 b, has an orbital period of Pb = 5.6 d, a mass of Mb = 9.8 ± 0.8 M⊕, and a radius of Rb = 2.37 ± 0.10 R⊕. The second transiting planet, TOI-763 c, has an orbital period of Pc = 12.3 d, a mass of Mc = 9.3 ± 1.0 M⊕, and a radius of Rc = 2.87 ± 0.11 R⊕. We find the outermost planet candidate to orbit the star with a period of ∼48 d. If confirmed as a planet, it would have a minimum mass of Md = 9.5 ± 1.6 M⊕. We investigated the TESS light curve in order to search for a mono transit by planet d without success. We discuss the importance and implications of this planetary system in terms of the geometrical arrangements of planets orbiting G-type stars.
(Less)
- author
- publishing date
- 2020-11-01
- type
- Contribution to journal
- publication status
- published
- keywords
- planets and satellites: detection, planets and satellites: individual: TIC 178819686, planets and satellites: individual: TOI-763
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 498
- issue
- 3
- pages
- 15 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85096944457
- ISSN
- 0035-8711
- DOI
- 10.1093/mnras/staa2502
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
- id
- bed83db4-fd37-4567-97c6-f043bb6601a5
- date added to LUP
- 2023-02-01 10:49:47
- date last changed
- 2023-02-21 10:18:02
@article{bed83db4-fd37-4567-97c6-f043bb6601a5,
abstract = {{<p>We report the discovery of a planetary system orbiting TOI-763(aka CD-39 7945), a V = 10.2, high proper motion G-type dwarf star that was photometrically monitored by the TESS space mission in Sector 10. We obtain and model the stellar spectrum and find an object slightly smaller than the Sun, and somewhat older, but with a similar metallicity. Two planet candidates were found in the light curve to be transiting the star. Combining TESS transit photometry with HARPS high-precision radial velocity (RV) follow-up measurements confirm the planetary nature of these transit signals. We determine masses, radii, and bulk densities of these two planets. A third planet candidate was discovered serendipitously in the RV data. The inner transiting planet, TOI-763 b, has an orbital period of Pb = 5.6 d, a mass of Mb = 9.8 ± 0.8 M⊕, and a radius of Rb = 2.37 ± 0.10 R⊕. The second transiting planet, TOI-763 c, has an orbital period of Pc = 12.3 d, a mass of Mc = 9.3 ± 1.0 M⊕, and a radius of Rc = 2.87 ± 0.11 R⊕. We find the outermost planet candidate to orbit the star with a period of ∼48 d. If confirmed as a planet, it would have a minimum mass of Md = 9.5 ± 1.6 M⊕. We investigated the TESS light curve in order to search for a mono transit by planet d without success. We discuss the importance and implications of this planetary system in terms of the geometrical arrangements of planets orbiting G-type stars.</p>}},
author = {{Fridlund, M. and Livingston, J. and Gandolfi, D. and Persson, C. M. and Lam, K. W.F. and Stassun, K. G. and Hellier, C. and Korth, J. and Hatzes, A. P. and Malavolta, L. and Luque, R. and Redfield, S. and Guenther, E. W. and Albrecht, S. and Barragan, O. and Benatti, S. and Bouma, L. and Cabrera, J. and Cochran, W. D. and Csizmadia, S. and Dai, F. and Deeg, H. J. and Esposito, M. and Georgieva, I. and Grziwa, S. and González Cuesta, L. and Hirano, T. and Jenkins, J. M. and Kabath, P. and Knudstrup, E. and Latham, D. W. and Mathur, S. and Mullally, S. E. and Narita, N. and Nowak, G. and Olofsson, A. O.H. and Palle, E. and Pätzold, M. and Pompei, E. and Rauer, H. and Ricker, G. and Rodler, F. and Seager, S. and Serrano, L. M. and Smith, A. M.S. and Spina, L. and Subjak, J. and Tenenbaum, P. and Ting, E. B. and Vanderburg, A. and Vanderspek, R. and Van Eylen, V. and Villanueva, S. and Winn, J. N.}},
issn = {{0035-8711}},
keywords = {{planets and satellites: detection; planets and satellites: individual: TIC 178819686; planets and satellites: individual: TOI-763}},
language = {{eng}},
month = {{11}},
number = {{3}},
pages = {{4503--4517}},
publisher = {{Oxford University Press}},
series = {{Monthly Notices of the Royal Astronomical Society}},
title = {{The TOI-763 system : Sub-Neptunes orbiting a Sun-like star}},
url = {{http://dx.doi.org/10.1093/mnras/staa2502}},
doi = {{10.1093/mnras/staa2502}},
volume = {{498}},
year = {{2020}},
}