2024A&A...691A.263M

Query : 2024A&A...691A.263M

2024A&A...691A.263M - Astronomy and Astrophysics, volume 691A263 (2024/11-1)

Direct imaging and dynamical mass of a benchmark T-type brown dwarf companion to HD 167665.

MAIRE A.-L., LECLERC A., BALMER W.O., DESIDERA S., LACOUR S., D'ORAZI V., SAMLAND M., LANGLOIS M., MATTHEWS E., BABUSIAUX C., KERVELLA P., LE BOUQUIN J.-B., SEGRANSAN D., GRATTON R., BILLER B.A., BONAVITA M., DELORME P., MESSINA S., UDRY S., JANSON M., HENNING T., WAHHAJ Z., ZURLO A., BONNEFOY M., BRANDNER W., CANTALLOUBE F., GALICHER R., KAMMERER J., NOWAK M., SHANGGUAN J., STOLKER T., WANG J.J., CHAUVIN G., HAGELBERG J., LAGRANGE A.-M., VIGAN A., MEYER M.R., BEUZIT J.-L., BOCCALETTI A., LAZZONI C., MESA D., PERROT C., SQUICCIARINI V., HINKLEY S., NASEDKIN E., ABUTER R., AMORIM A., BENISTY M., BERGER J.-P., BLUNT S., BONNET H., BOURDAROT G., CASELLI P., CHARNAY B., CHOQUET E., CHRISTIAENS V., CLENET Y., COUDE DU FORESTO V., CRIDLAND A., DEMBET R., DEXTER J., DRESCHER A., DUVERT G., ECKART A., EISENHAUER F., GAO F., GARCIA P., GARCIA LOPEZ R., GENDRON E., GENZEL R., GILLESSEN S., GIRARD J.H., HAUBOIS X., HEISSEL G., HIPPLER S., HOULLE M., HUBERT Z., JOCOU L., KREIDBERG L., LAPEYRERE V., LENA P., LUTZ D., MENARD F., MERAND A., MOLLIERE P., MONNIER J.D., MOUILLET D., OTT T., OTTEN G.P.P.L., PALADINI C., PAUMARD T., PERRAUT K., PERRIN G., PFUHL O., POURRE N., PUEYO L., RICKMAN E., ROUSSET G., RUSTAMKULOV Z., SHIMIZU T., SING D., STADLER J., STRAUB O., STRAUBMEIER C., STURM E., TACCONI L.J., VAN DISHOECK E.F., VINCENT F., VON FELLENBERG S.D., WIDMANN F., WIEPRECHT E., WOILLEZ J., YAZICI S. (The GRAVITY Collaboration)

Abstract (from CDS):

Context. A low-mass companion potentially in the brown dwarf mass regime was discovered on a ∼12 yr orbit (∼5.5 au) around HD 167665 using radial velocity (RV) monitoring. Joint RV-astrometry analyses confirmed that HD 167665B is a brown dwarf with precisions on the measured mass of ∼4-9%. Brown dwarf companions with measured mass and luminosity are valuable for testing formation and evolutionary models. However, its atmospheric properties and luminosity are still unconstrained, preventing detailed tests of evolutionary models.
Aims. We further characterize the HD 167665 system by measuring the luminosity and refining the mass of its companion and reassessing the stellar age.
Methods. We present new high-contrast imaging data of the star and of its close-in environment from SPHERE and GRAVITY, which we combined with RV data from CORALIE and HIRES and astrometry from HIPPARCOS and Gaia.
Results. The analysis of the host star properties indicates an age of 6.20 ± 1.13 Gyr. GRAVITY reveals a point source near the position predicted from a joint fit of RV data and HIPPARCOS-Gaia proper motion anomalies. Subsequent SPHERE imaging confirms the detection and reveals a faint point source of contrast of ∆H2 = 10.95 ± 0.33 mag at a projected angular separation of ∼180 mas. A joint fit of the high-contrast imaging, RV, and HIPPARCOS intermediate astrometric data together with the Gaia astrometric parameters constrains the mass of HD 167665B to ∼1.2%, 60.3 ± 0.7 MJ. The SPHERE colors and spectrum point to an early or mid-T brown dwarf of spectral type T4–2+1. Fitting the SPHERE spectrophotometry and GRAVITY spectrum with synthetic spectra suggests an effective temperature of ∼1000-1150 K, a surface gravity of ∼5.0-5.4 dex, and a bolometric luminosity log(L/L⊙)=-4.892–0.028+0.024 dex. The mass, luminosity, and age of the companion can only be reproduced within 3σ by the hybrid cloudy evolutionary models of Saumon & Marley (2008, ApJ, 689, 1327), whereas cloudless evolutionary models underpredict its luminosity.

Abstract Copyright: © The Authors 2024

Journal keyword(s): methods: data analysis - techniques: high angular resolution - techniques: image processing - planets and satellites: dynamical evolution and stability - brown dwarfs - stars: individual: HD 167665

Simbad objects: 36

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Number of rows : 36
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 HD 4113C BD* 00 43 12.59 -37 58 57.4           T9 33 0
2 V* GU Psc B BD* 01 12 36.53808 +17 04 29.9424           T2+T8 81 1
3 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
4 HD 13724b Pl 02 12 20.6772821184 -46 48 58.954833684           ~ 16 0
5 HD 19467B BD* 03 07 18.48 -13 45 43.3           T5.5+1 57 0
6 HD 19467 PM* 03 07 18.5750514360 -13 45 42.417982152   7.65 7.00 7.79 8.82 G3V 197 0
7 HD 28736B BD* 04 32 04.78 +05 24 35.8           T 19 0
8 * 51 Eri b Pl 04 37 36.1326090888 -02 28 24.775726260           ~ 238 0
9 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 627 1
10 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 549 0
11 BD+12 1221 * 06 37 36.5818764720 +12 10 11.194073544   10.97 9.11     G5 10 0
12 HD 72946 ** 08 35 51.2666658240 +06 37 21.954760284 8.23 7.77 7.08     G8-V 147 1
13 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
14 HD 76346 ** 08 53 03.7790012472 -56 38 58.147535688   5.982 5.998     A0V 66 0
15 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 321 0
16 HD 106906B BD* 12 17 52.61 -55 58 26.6           L2.5 115 0
17 SIPS J1256-1257B BD* 12 56 01.83264 -12 57 27.6912           L7 154 0
18 * e Vir b Pl 13 16 46.5148594512 +09 25 26.960139646           ~ 127 1
19 HD 115470b Pl? 13 18 05.1042607440 -44 03 19.380018204           ~ 15 0
20 HD 116434C BD* 13 24 36.13 -51 30 16.7           L5-7 123 1
21 NAME UScoCTIO 108B BD? 16 05 54.09504 -18 18 48.8592           ~ 51 0
22 RX J1609.5-2105B LM* 16 09 30.377 -21 04 56.97           ~ 123 0
23 NAME GSC 06214-00210B LM* 16 21 54.678 -20 43 11.33           ~ 102 0
24 2MASS J16471580+5632057 BD* 16 47 15.80544 +56 32 05.7264           L9pec 39 0
25 HD 167665 SB* 18 17 23.7587105112 -28 17 20.218638480   6.87 6.36     F9VFe-0.8CH-0.4+T4 125 0
26 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0V 2787 1
27 HD 176535B BD* 19 01 19.52 -13 41 26.5           L9.0 4 0
28 HD 182488B BD* 19 23 34.0227 +33 13 19.041           T9 79 0
29 * zet Del B BD* 20 35 19.05 +14 40 15.6           L5 16 0
30 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 143 0
31 2MASS J21513839-4853542 BD* 21 51 38.39304 -48 53 54.2508           T4.5 21 0
32 * eps Ind B BD* 22 04 10.5951812451 -56 46 58.239102418     24.12 20.8 15.60 T1V+T6V 176 1
33 HD 218396e Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 255 1
34 HD 218396c Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 312 1
35 HD 218396d Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 286 1
36 HD 218396b Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 323 1

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