The TOI-763 system: sub-Neptunes orbiting a Sun-like star

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10431377" target="_blank" >RIV/00216208:11320/20:10431377 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=LMuMncNQaE" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=LMuMncNQaE</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/staa2502" target="_blank" >10.1093/mnras/staa2502</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The TOI-763 system: sub-Neptunes orbiting a Sun-like star

Popis výsledku v původním jazyce

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 P-b = 5.6 d, a mass of M-b = 9.8 +/- 0.8M(circle dot), and a radius of R-b = 2.37 +/- 0.10 R-circle dot. The second transiting planet, TOI-763 c, has an orbital period of P-c = 12.3 d, a mass of M-c = 9.3 +/- 1.0M(circle plus), and a radius of R-c = 2.87 +/- 0.11 R-circle plus. We find the outermost planet candidate to orbit the star with a period of similar to 48 d. If confirmed as a planet, it would have a minimum mass of M-d = 9.5 +/- 1.6M(circle plus). 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.

Název v anglickém jazyce

The TOI-763 system: sub-Neptunes orbiting a Sun-like star

Popis výsledku anglicky

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 P-b = 5.6 d, a mass of M-b = 9.8 +/- 0.8M(circle dot), and a radius of R-b = 2.37 +/- 0.10 R-circle dot. The second transiting planet, TOI-763 c, has an orbital period of P-c = 12.3 d, a mass of M-c = 9.3 +/- 1.0M(circle plus), and a radius of R-c = 2.87 +/- 0.11 R-circle plus. We find the outermost planet candidate to orbit the star with a period of similar to 48 d. If confirmed as a planet, it would have a minimum mass of M-d = 9.5 +/- 1.6M(circle plus). 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

498

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

15

Strana od-do

4503-4517

Kód UT WoS článku

000587752500112

EID výsledku v databázi Scopus

2-s2.0-85096944457