2017A&A...608A..79D

Query : 2017A&A...608A..79D

2017A&A...608A..79D - Astronomy and Astrophysics, volume 608A, 79-79 (2017/12-1)

In-depth study of moderately young but extremely red, very dusty substellar companion HD 206893B.

DELORME P., SCHMIDT T., BONNEFOY M., DESIDERA S., GINSKI C., CHARNAY B., LAZZONI C., CHRISTIAENS V., MESSINA S., D'ORAZI V., MILLI J., SCHLIEDER J.E., GRATTON R., RODET L., LAGRANGE A.-M., ABSIL O., VIGAN A., GALICHER R., HAGELBERG J., BONAVITA M., LAVIE B., ZURLO A., OLOFSSON J., BOCCALETTI A., CANTALLOUBE F., MOUILLET D., CHAUVIN G., HAMBSCH F.-J., LANGLOIS M., UDRY S., HENNING T., BEUZIT J.-L., MORDASINI C., LUCAS P., MAROCCO F., BILLER B., CARSON J., CHEETHAM A., COVINO E., DE CAPRIO V., DELBOULBE A., FELDT M., GIRARD J., HUBIN N., MAIRE A.-L., PAVLOV A., PETIT C., ROUAN D., ROELFSEMA R. and WILDI F.

Abstract (from CDS):

Context. The substellar companion HD 206893b has recently been discovered by direct imaging of its disc-bearing host star with the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument.
Aims. We investigate the atypical properties of the companion, which has the reddest near-infrared colours among all known substellar objects, either orbiting a star or isolated, and we provide a comprehensive characterisation of the host star-disc-companion system.
Methods. We conducted a follow-up of the companion with adaptive optics imaging and spectro-imaging with SPHERE, and a multi-instrument follow-up of its host star. We obtain a R=30 spectrum from 0.95 to 1.64µm of the companion and additional photometry at 2.11 and 2.25µm. We carried out extensive atmosphere model fitting for the companions and the host star in order to derive their age, mass, and metallicity.
Results. We found no additional companion in the system in spite of exquisite observing conditions resulting in sensitivity to 6MJup (2MJup) at 0.5'' for an age of 300Myr (50Myr). We detect orbital motion over more than one year and characterise the possible Keplerian orbits. We constrain the age of the system to a minimum of 50Myr and a maximum of 700Myr, and determine that the host-star metallicity is nearly solar. The comparison of the companion spectrum and photometry to model atmospheres indicates that the companion is an extremely dusty late L dwarf, with an intermediate gravity (logg∼4.5-5.0) which is compatible with the independent age estimate of the system.
Conclusions. Though our best fit corresponds to a brown dwarf of 15-30MJup aged 100-300Myr, our analysis is also compatible with a range of masses and ages going from a 50Myr 12MJup planetary-mass object to a 50MJup Hyades-age brown dwarf. Even though this companion is extremely red, we note that it is more probable that it has an intermediate gravity rather than the very low gravity that is often associated with very red L dwarfs. We also find that the detected companion cannot shape the observed outer debris disc, hinting that one or several additional planetary mass objects in the system might be necessary to explain the position of the disc inner edge.

Abstract Copyright: © ESO, 2017

Journal keyword(s): brown dwarfs - planets and satellites: atmospheres - techniques: high angular resolution - planet-disk interactions - planet-disk interactions

Simbad objects: 57

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Number of rows : 57
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 2MASS J00011217+1535355 BD* 00 01 12.1649057559 +15 35 35.544459777           L4 27 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3914 0
3 LSPM J0036+1821 BD* 00 36 16.1118891182 +18 21 10.286665966       18.451 16.053 L3.5 213 0
4 2MASS J00470038+6803543 BD* 00 47 00.38664 +68 03 54.3672           L9pec 77 0
5 V* GU Psc B BD* 01 12 36.53808 +17 04 29.9424           T3.5 68 0
6 LEHPM 1481B BD* 01 22 50.86 -24 39 51.6           L4-6 34 0
7 2MASS J02062493+2640237 BD* 02 06 24.93192 +26 40 23.7540           L9pec 18 0
8 NAME 2MASS J02192210-3925225b Pl 02 19 22.1103954432 -39 25 22.539937296           ~ 12 0
9 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1616128256 +25 40 23.239779672         17.36 L0V 126 0
10 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3434 0
11 PSO J057.2893+15.2433 BD* 03 49 09.44 +15 14 36.0           L7 11 0
12 2MASS J03552337+1133437 BD* 03 55 23.3735910810 +11 33 43.797034332           L5gamma 113 0
13 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3074 0
14 * 51 Eri b Pl 04 37 36.1326090888 -02 28 24.775726260           ~ 180 0
15 2MASS J05012406-0010452 BD* 05 01 24.0852555792 -00 10 45.591750444           L4gamma 55 0
16 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1021 0
17 SIPS J0539-0059 BD* 05 39 52.0040375405 -00 59 01.491092352           L5V 88 0
18 CD-35 2722B BD* 06 09 19.2082646634 -35 49 31.062882043           L0-1 61 0
19 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 471 0
20 HD 50571B BD* 06 50 00.93 -60 14 56.7           L4-10 26 0
21 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1564 0
22 G 196-3B BD* 10 04 20.6391105792 +50 22 59.378638152           L3beta 101 0
23 SIPS J1058-1548 BD* 10 58 47.8366017792 -15 48 17.250428304       20.095 17.764 L3V 100 2
24 NAME TW Hya Association As* 11 01.9 -34 42           ~ 942 0
25 TWA 42 BD* 11 19 32.54328 -11 37 46.6968           L7 38 0
26 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 281 0
27 HD 106906B BD* 12 17 52.61 -55 58 26.6           L2.5 97 0
28 SIPS J1256-1257B BD* 12 56 01.83264 -12 57 27.6912           L7 84 0
29 2MASS J14392836+1929149 BD* 14 39 28.1499428599 +19 29 15.908790370           L1V 131 0
30 NAME HD 131399Ab err 14 54 25.3 -34 08 34           ~ 23 1
31 NAME UScoCTIO 108B BD? 16 05 54.09504 -18 18 48.8592           ~ 50 0
32 RX J1609.5-2105B LM* 16 09 30.377 -21 04 56.97           ~ 118 0
33 2MASS J16471580+5632057 BD* 16 47 15.80544 +56 32 05.7264           L9pec 33 0
34 2MASS J17081563+2557474 BD* 17 08 15.630 +25 57 47.44           L5red 4 0
35 2MASS J17410280-4642218 BD* 17 41 02.80656 -46 42 21.8520           L5:gamma 23 0
36 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2686 1
37 V* PZ Tel BY* 18 53 05.8735056984 -50 10 49.897437168   9.22 8.342   7.464 G9IV 332 0
38 HD 182488B BD* 19 23 34.0126 +33 13 19.078           T9 69 0
39 NGC 6811 OpC 19 37 21.6 +46 22 41   7.47 6.8     ~ 378 0
40 * zet Del B BD* 20 35 19.05 +14 40 15.6           L5 14 0
41 2MASS J21140802-2251358 BD* 21 14 08.02560 -22 51 35.8380           L7.5 111 0
42 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 126 0
43 HD 206893b Pl 21 45 21.9052532928 -12 47 00.060804636           ~ 40 0
44 HD 206893 PM* 21 45 21.9052532928 -12 47 00.060804636   7.11 6.67     F5V 113 0
45 HD 206926 * 21 45 46.5317085216 -12 31 50.360671020   10.15 9.03     K0III 4 0
46 HD 207006 * 21 46 18.0332705520 -12 35 55.145021028   8.55 7.55     G8III 11 0
47 2MASSW J2148162+400359 BD* 21 48 16.2986589335 +40 03 59.331851811           L7 66 0
48 2MASS J21543454-1055308 BD* 21 54 34.54272 -10 55 30.8424           L5 16 0
49 2MASSW J2206450-421721 BD* 22 06 45.0009530760 -42 17 21.139647720       21.485 19.034 L2V 32 1
50 2MASS J22271087-0045471 BD* 22 27 10.913 -00 45 47.31           L7.0 15 0
51 PM J22364+4751 PM* 22 36 24.5258223768 +47 51 42.530986512     12.8 12.046   ~ 17 0
52 2MASS J22443167+2043433 BD* 22 44 31.67376 +20 43 43.3020           L6-L8gamma 99 0
53 HD 218396e Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 208 1
54 HD 218396d Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 238 1
55 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1138 0
56 2MASS J23433470-3646021 BD* 23 43 34.70640 -36 46 02.1972           L3-L6 9 0
57 NAME Argus Association As* ~ ~           ~ 228 0

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