2018A&A...615A.160C

Query : 2018A&A...615A.160C

2018A&A...615A.160C - Astronomy and Astrophysics, volume 615A, 160-160 (2018/7-1)

Discovery of a brown dwarf companion to the star HIP 64892.

CHEETHAM A., BONNEFOY M., DESIDERA S., LANGLOIS M., VIGAN A., SCHMIDT T., OLOFSSON J., CHAUVIN G., KLAHR H., GRATTON R., D'ORAZI V., HENNING T., JANSON M., BILLER B., PERETTI S., HAGELBERG J., SEGRANSAN D., UDRY S., MESA D., SISSA E., KRAL Q., SCHLIEDER J., MAIRE A.-L., MORDASINI C., MENARD F., ZURLO A., BEUZIT J.-L., FELDT M., MOUILLET D., MEYER M., LAGRANGE A.-M., BOCCALETTI A., KEPPLER M., KOPYTOVA T., LIGI R., ROUAN D., LE COROLLER H., DOMINIK C., LAGADEC E., TURATTO M., ABE L., ANTICHI J., BARUFFOLO A., BAUDOZ P., BLANCHARD P., BUEY T., CARBILLET M., CARLE M., CASCONE E., CLAUDI R., COSTILLE A., DELBOULBE A., DE CAPRIO V., DOHLEN K., FANTINEL D., FEAUTRIER P., FUSCO T., GIRO E., GLUCK L., HUBIN N., HUGOT E., JAQUET M., KASPER M., LLORED M., MADEC F., MAGNARD Y., MARTINEZ P., MAUREL D., LE MIGNANT D., MOLLER-NILSSON O., MOULIN T., ORIGNE A., PAVLOV A., PERRET D., PETIT C., PRAGT J., PUGET P., RABOU P., RAMOS J., RIGAL F., ROCHAT S., ROELFSEMA R., ROUSSET G., ROUX A., SALASNICH B., SAUVAGE J.-F., SEVIN A., SOENKE C., STADLER E., SUAREZ M., WEBER L. and WILDI F.

Abstract (from CDS):

We report the discovery of a bright, brown dwarf companion to the star HIP 64892, imaged with VLT/SPHERE during the SHINE exoplanet survey. The host is a B9.5V member of the Lower-Centaurus-Crux subgroup of the Scorpius Centaurus OB association. The measured angular separation of the companion (1.2705±0.0023") corresponds to a projected distance of 159±12AU. We observed the target with the dual-band imaging and long-slit spectroscopy modes of the IRDIS imager to obtain its spectral energy distribution (SED) and astrometry. In addition, we reprocessed archival NACO L-band data, from which we also recover the companion. Its SED is consistent with a young (<30Myr), low surface gravity object with a spectral type of M9γ±1. From comparison with the BT-Settl atmospheric models we estimate an effective temperature of Teff=2600±100K, and comparison of the companion photometry to the COND evolutionary models yields a mass of ∼29-37MJ at the estimated age of 16–7+15Myr for the system. The star HIP 64892 is a rare example of an extreme-mass ratio system (q∼0.01) and will be useful for testing models relating to the formation and evolution of such low-mass objects.

Abstract Copyright: © ESO 2018

Journal keyword(s): brown dwarfs - stars: individual: HIP 64892 - techniques: high angular resolution - planets and satellites: detection - planets and satellites: atmospheres

CDS comments: Fig.8 2M1731-271 not identified, incomplete format.

Simbad objects: 32

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Number of rows : 32
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 HD 1160B LM* 00 15 57.26 +04 15 03.7           ~ 32 0
2 HD 1160 * 00 15 57.3019549776 +04 15 04.009943520   7.159 7.119     A0V 91 1
3 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1905 1
4 HD 76346 ** 08 53 03.7790012472 -56 38 58.147535688   5.982 5.998     A0V 57 0
5 LP 666-9 LM* 08 53 36.1604798120 -03 29 32.197505547     18.959 16.781 14.487 M9Ve 252 0
6 HD 95086b Pl 10 57 03.0215719872 -68 40 02.449216128           ~ 102 1
7 NAME TW Hya Association As* 11 01.9 -34 42           ~ 942 0
8 TWA 28 LM* 11 02 09.8378779824 -34 30 35.562199176     21.46 19.14 17.90 M8.3 70 0
9 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 338 0
10 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 281 0
11 HD 106906B BD* 12 17 52.61 -55 58 26.6           L2.5 97 0
12 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 478 1
13 CD-40 7581 Er* 12 56 12.2594123496 -41 22 19.470692532   12.30 11.46   10.397 K2V 12 0
14 HD 115470 * 13 18 05.1042607440 -44 03 19.380018204   6.77 6.79     B9.5V 36 0
15 HD 115470b Pl? 13 18 05.1042607440 -44 03 19.380018204           ~ 10 0
16 HD 116434 ** 13 24 36.0977360304 -51 30 16.044711840   7.08 6.98   6.87 A2V 71 0
17 HD 116434C BD* 13 24 36.13 -51 30 16.7           L5-7 82 1
18 2MASS J14392836+1929149 BD* 14 39 28.1499428599 +19 29 15.908790370           L1V 131 0
19 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 475 1
20 HD 142250B LM* 15 54 30.4773546672 -27 19 57.359301384           M8.5-9.5 10 0
21 HD 143567B LM* 16 01 55.65696 -21 58 53.0076           M8 39 0
22 NAME UScoCTIO 108B BD? 16 05 54.09504 -18 18 48.8592           ~ 50 0
23 RX J1609.5-2105B LM* 16 09 30.377 -21 04 56.97           ~ 118 0
24 NAME Upper Sco Association As* 16 12 -23.4           ~ 1369 1
25 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1331 1
26 V* PZ Tel BY* 18 53 05.8735056984 -50 10 49.897437168   9.22 8.342   7.464 G9IV 332 0
27 VB 10 Er* 19 16 57.6109547886 +05 09 01.600923413     17.30     M8V 476 1
28 * eta Tel B LM* 19 22 51.3580284238 -54 25 31.569876496           M7.5V 72 0
29 SIPS J2000-7523 LM* 20 00 48.4144804656 -75 23 06.871799940     21.157 18.379 16.119 M9 26 0
30 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 126 0
31 * kap And PM* 23 40 24.5076320 +44 20 02.156595 3.80 4.06 4.14 4.15 4.22 B9IVn 199 0
32 * kap And B BD* 23 40 24.58 +44 20 02.8           L1 80 0

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