2017A&A...608A.106B

Query : 2017A&A...608A.106B

2017A&A...608A.106B - Astronomy and Astrophysics, volume 608A, 106-106 (2017/12-1)

Orbiting a binary. SPHERE characterisation of the HD 284149 system.

BONAVITA M., D'ORAZI V., MESA D., FONTANIVE C., DESIDERA S., MESSINA S., DAEMGEN S., GRATTON R., VIGAN A., BONNEFOY M., ZURLO A., ANTICHI J., AVENHAUS H., BARUFFOLO A., BAUDINO J.L., BEUZIT J.L., BOCCALETTI A., BRUNO P., BUEY T., CARBILLET M., CASCONE E., CHAUVIN G., CLAUDI R.U., DE CAPRIO V., FANTINEL D., FARISATO G., FELDT M., GALICHER R., GIRO E., GRY C., HAGELBERG J., INCORVAIA S., JANSON M., JAQUET M., LAGRANGE A.M., LANGLOIS M., LANNIER J., LE COROLLER H., LESSIO L., LIGI R., MAIRE A.L., MEYER M., MENARD F., PERROT C., PERETTI S., PETIT C., RAMOS J., ROUX A., SALASNICH B., SALTER G., SAMLAND M., SCUDERI S., SCHLIEDER J., SUREZ M., TURATTO M. and WEBER L.

Abstract (from CDS):

Aims. In this paper we present the results of the SPHERE observation of the HD 284149 system, aimed at a more detailed characterisation of both the primary and its brown dwarf companion.
Methods. We observed HD 284149 in the near-infrared with SPHERE, using the imaging mode (IRDIS+IFS) and the long-slit spectroscopy mode (IRDIS-LSS). The data were reduced using the dedicated SPHERE pipeline, and algorithms such as PCA and TLOCI were applied to reduce the speckle pattern.
Results. The IFS images revealed a previously unknown low-mass (∼0.16M☉) stellar companion (HD 294149 B) at ∼0.1'', compatible with previously observed radial velocity differences, as well as proper motion differences between Gaia and Tycho-2 measurements. The known brown dwarf companion (HD 284149 b) is clearly visible in the IRDIS images. This allowed us to refine both its photometry and astrometry. The analysis of the medium resolution IRDIS long slit spectra also allowed a refinement of temperature and spectral type estimates. A full reassessment of the age and distance of the system was also performed, leading to more precise values of both mass and semi-major axis.
Conclusions. As a result of this study, HD 284149 ABb therefore becomes the latest addition to the (short) list of brown dwarfs on wide circumbinary orbits, providing new evidence to support recent claims that object in such configuration occur with a similar frequency to wide companions to single stars.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: individual: HD 284149 - brown dwarfs - binaries: visual - stars: rotation - techniques: high angular resolution - techniques: high angular resolution

VizieR on-line data: <Available at CDS (J/A+A/608/A106): spectra.dat>

Simbad objects: 22

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Number of rows : 22
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 NAME THA As* 00 00 -62.0           ~ 468 0
2 2MASSW J0335020+234235 LM* 03 35 02.0907239832 +23 42 35.413750692       17.67   M8.5V 56 0
3 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 289 0
4 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3436 0
5 HD 284149 TT* 04 06 38.7981157344 +20 18 11.151888084   10.21 9.63     F8 53 0
6 HD 284149b * 04 06 38.8 +20 18 11           ~ 13 0
7 HD 284142 * 04 07 08.4727108080 +21 15 46.403163108   9.87 8.76     K2 10 0
8 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4418 0
9 2MASS J04493288+1607226 LM* 04 49 32.8917203808 +16 07 22.407236580           M9 3 0
10 HD 294149 * 05 27 50.3344043976 -05 01 35.136540984   11.63 11.39     A0 4 0
11 CD-35 2722B BD* 06 09 19.2082646634 -35 49 31.062882043           L0-1 61 0
12 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 471 0
13 HD 77281 * 09 01 38.0090336520 -01 28 34.767080940   7.49 7.35     A3IV 42 0
14 2MASSI J0953212-101420 BD* 09 53 21.2728403904 -10 14 20.651592552         16.819 L0.0V 16 0
15 CD-26 8623B TT* 11 32 41.1733260768 -26 52 09.107765976   16.70 15.22 13.68 11.76 M5.5 75 0
16 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 281 0
17 TWA 11C Y*? 12 35 48.9396090720 -39 50 24.567159768   15.94 14.43 14.07   ~ 31 0
18 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 774 0
19 UScoCTIO 108 LM* 16 05 54.0734809368 -18 18 44.376318180           M7 44 0
20 RX J1609.5-2105B LM* 16 09 30.377 -21 04 56.97           ~ 118 0
21 V* PZ Tel BY* 18 53 05.8735056984 -50 10 49.897437168   9.22 8.342   7.464 G9IV 332 0
22 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 126 0

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