Evolution of BD-14 3065b (TOI-4987b) from giant planet to brown dwarf as possible evidence of deuterium burning at old stellar ages

SUBJAK, Jan, David W LATHAM, Samuel N QUINN, Perry BERLIND, Michael L CALKINS, Gilbert A ESQUERDO, Rafael BRAHM, Jose A CABALLERO, Karen A COLLINS, Eike GUENTHER, Jan JANÍK, Petr KABÁTH, Richard P SCHWARZ, Thiam-Guan TAN, Leonardo VANZI, Roberto ZAMBELLI, Carl ZIEGLER, Jon M JENKINS, Ismael MIRELES, Sara SEAGER, Avi SHPORER, Stephanie STRIEGEL and Joshua N WINN. Evolution of BD-14 3065b (TOI-4987b) from giant planet to brown dwarf as possible evidence of deuterium burning at old stellar ages. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2024, vol. 688, August, p. 1-23. ISSN 0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/202349028.

Basic information

• Original name: Evolution of BD-14 3065b (TOI-4987b) from giant planet to brown dwarf as possible evidence of deuterium burning at old stellar ages
• Name in Czech: Evolution of BD-14 3065b (TOI-4987b) from giant planet to brown dwarf as possible evidence of deuterium burning at old stellar ages
• Authors: SUBJAK, Jan, David W LATHAM, Samuel N QUINN, Perry BERLIND, Michael L CALKINS, Gilbert A ESQUERDO, Rafael BRAHM, Jose A CABALLERO, Karen A COLLINS, Eike GUENTHER, Jan JANÍK (203 Czech Republic, belonging to the institution), Petr KABÁTH (203 Czech Republic), Richard P SCHWARZ, Thiam-Guan TAN, Leonardo VANZI, Roberto ZAMBELLI, Carl ZIEGLER, Jon M JENKINS, Ismael MIRELES, Sara SEAGER, Avi SHPORER, Stephanie STRIEGEL and Joshua N WINN.
• Edition: ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2024, 0004-6361.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10308 Astronomy
• Country of publisher: France
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 6.500 in 2022
• Organization unit: Faculty of Science
• Doi: http://dx.doi.org/10.1051/0004-6361/202349028
• UT WoS: 001289291100017
• Keywords (in Czech): techniques: photometric; techniques: radial velocities; techniques: spectroscopic; planets and satellites: gaseous planets; brown dwarfs
• Keywords in English: techniques: photometric; techniques: radial velocities; techniques: spectroscopic; planets and satellites: gaseous planets; brown dwarfs
• Tags: International impact, Reviewed

Abstract

The present study confirms BD-14 3065b as a transiting planet-brown dwarf in a triple-star system, with a mass near the deuterium-burning boundary. BD-14 3065b has the largest radius observed within the sample of giant planets and brown dwarfs around post-main sequence stars. Its orbital period is 4.3 days and it transits a subgiant F-type star with a mass of M-* = 1.41 +/- 0.05 M-circle dot, a radius of R-* = 2.35 +/- 0.08 R-circle dot, an effective temperature of T-eff = 6935 +/- 90 K, and a metallicity of -0.34 +/- 0.05 dex. By combining TESS photometry with high-resolution spectra acquired with the TRES and Pucheros+ spectrographs, we measured a mass of M-p = 12.37 +/- 0.92 M-Jup and a radius of R-p = 1.926 +/- 0.094 R-Jup. Our discussion of potential processes that could be responsible for the inflated radius led us to conclude that deuterium burning is a plausible explanation for the heating taking place in BD-14 3065b's interior. Detections of the secondary eclipse with TESS photometry enabled a precise determination of the eccentricity, e(p) = 0.066 +/- 0.011, and reveal that BD-14 3065b has a brightness temperature of 3520 +/- 130 K. With its unique characteristics, BD-14 3065b presents an excellent opportunity to study its atmosphere via thermal emission spectroscopy.