2023AJ....165..268V

Query : 2023AJ....165..268V

2023AJ....165..268V - Astron. J., 165, 268 (2023/June-0)

HIP 33609 b: An Eccentric Brown Dwarf Transiting a V = 7.3 Rapidly Rotating B Star.

VOWELL N., RODRIGUEZ J.E., QUINN S.N., ZHOU G., VANDERBURG A., MANN A.W., HOOTON M.J., STASSUN K.G., HOWARD S., BIERYLA A., LATHAM D.W., HOWELL S.B., GUILLOT T., ZIEGLER C., COLLINS K.A., CARMICHAEL T.W., JENKINS J.M., SHPORER A., ABE L., BENDJOYA P., BUSH J.L., BUTTU M., COLLINS K.I., EASTMAN J.D., FIELDS M.J., GASPARETTO T., GUNTHER M.N., KOSTOV V.B., KRAUS A.L., LESTER K.V., LEVINE A.M., LITTLEFIELD C., MARIE-SAINTE W., MEKARNIA D., OSBORN H.P., RAPETTI D., RICKER G.R., SEAGER S., SEFAKO R., SRDOC G., SUAREZ O., TORRES G., TRIAUD A.H.M.J., VANDERSPEK R. and WINN J.N.

Abstract (from CDS):

We present the discovery and characterization of HIP 33609 b, a transiting warm brown dwarf orbiting a late B star, discovered by NASA's Transiting Exoplanet Survey Satellite as TOI-588 b. HIP 33609 b is a large (Rb = ${1.580}_{-0.070}^{+0.074}$RJ) brown dwarf on a highly eccentric (e = ${0.560}_{-0.031}^{+0.029}$) orbit with a 39 days period. The host star is a bright (V = 7.3 mag), Teff = 10,400${}_{-660}^{+800}$ K star with a mass of M* = ${2.383}_{-0.095}^{+0.10}$M⊙ and radius of R* = ${1.863}_{-0.082}^{+0.087}$R⊙, making it the hottest transiting brown dwarf host star discovered to date. We obtained radial velocity measurements from the CHIRON spectrograph confirming the companion's mass of Mb = ${68.0}_{-7.1}^{+7.4}$MJ as well as the host star's rotation rate ($v\sin {i}_{* }=55.6\pm 1.8$ km s–1). We also present the discovery of a new comoving group of stars, designated as MELANGE-6, and determine that HIP 33609 is a member. We use a combination of rotation periods and isochrone models fit to the cluster members to estimate an age of 150 ± 25 Myr. With a measured mass, radius, and age, HIP 33609 b becomes a benchmark for substellar evolutionary models.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanets - Brown dwarfs - Young star clusters - Direct imaging - CCD photometry - High resolution spectroscopy - Exoplanet evolution

VizieR on-line data: <Available at CDS (J/AJ/165/268): table2.dat fig6.dat>

Nomenclature: MELANGE-N (No. 6).

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 KELT-1b Pl 00 01 26.9168207928 +39 23 01.784206464           ~ 149 0
2 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
3 [CKS2019] COIN-Gaia 13 OpC 05 33 24.9 +42 00 58           ~ 39 0
4 HD 52470 * 06 58 59.9803549176 -47 01 24.051948420   7.26 7.27     A0V 26 0
5 HD 52470b Pl 06 58 59.9803549176 -47 01 24.051948420           ~ 11 0
6 MELANGE-6 As* 07 00 -47.5           ~ 5 0
7 KOI-415 Ro* 19 33 13.4494812696 +41 36 22.965562764           ~ 58 0
8 HD 195689b Pl 20 31 26.3534153736 +39 56 19.773037500           ~ 358 0
9 HD 201033b Pl 21 04 48.8646514344 +55 35 16.514573928           ~ 31 0

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