TOI-1408: Discovery and photodynamical modeling of a small inner companion to a hot Jupiter revealed by transit timing variations

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00597664" target="_blank" >RIV/67985815:_____/24:00597664 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/24:00138729

Result on the web

<a href="https://hdl.handle.net/11104/0355540" target="_blank" >https://hdl.handle.net/11104/0355540</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/2041-8213/ad65fd" target="_blank" >10.3847/2041-8213/ad65fd</a>

Result language

angličtina

Original language name

TOI-1408: Discovery and photodynamical modeling of a small inner companion to a hot Jupiter revealed by transit timing variations

Original language description

We report the discovery and characterization of a small planet, TOI-1408 c, on a 2.2 day orbit located interior to a previously known hot Jupiter, TOI-1408 b (P = 4.42 days, M = 1.86 +/- 0.02 M Jup, R = 2.4 +/- 0.5 R Jup) that exhibits grazing transits. The two planets are near 2:1 period commensurability, resulting in significant transit timing variations (TTVs) for both planets and transit duration variations for the inner planet. The TTV amplitude for TOI-1408 c is 15% of the planet's orbital period, marking the largest TTV amplitude relative to the orbital period measured to date. Photodynamical modeling of ground-based radial velocity (RV) observations and transit light curves obtained with the Transiting Exoplanet Survey Satellite and ground-based facilities leads to an inner planet radius of 2.22 +/- 0.06 R circle plus and mass of 7.6 +/- 0.2 M circle plus that locates the planet into the sub-Neptune regime. The proximity to the 2:1 period commensurability leads to the libration of the resonant argument of the inner planet. The RV measurements support the existence of a third body with an orbital period of several thousand days. This discovery places the system among the rare systems featuring a hot Jupiter accompanied by an inner low-mass planet.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Astrophysical Journal Letters

ISSN

2041-8205

e-ISSN

2041-8213

Volume of the periodical

971

Issue of the periodical within the volume

2

Country of publishing house

US - UNITED STATES

Number of pages

14

Pages from-to

L28

UT code for WoS article

001288931700001

EID of the result in the Scopus database

2-s2.0-85201316198