2017AJ....154..262M


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.20CET02:01:13

2017AJ....154..262M - Astron. J., 154, 262-262 (2017/December-4)

The prototypical young L/T-Transition dwarf HD 203030B likely has planetary mass.

MILES-PAEZ P.A., METCHEV S., LUHMAN K.L., MARENGO M. and HULSEBUS A.

Abstract (from CDS):

Upon its discovery in 2006, the young L7.5 companion to the solar analog HD 203030 was found to be ~200 K cooler than older late-L dwarfs, which is quite unusual. HD 203030B offered the first clear indication that the effective temperature at the L-to-T spectral type transition depends on surface gravity: now a well-known characteristic of low-gravity ultra-cool dwarfs. An initial age analysis of the G8V primary star indicated that the system was 130-400 Myr old, and so the companion would be between 12 and 31 MJup. Using moderate-resolution near-infrared spectra of HD 203030B, we now find features of very low gravity comparable to those of 10-150 Myr old L7-L8 dwarfs. We also obtained more accurate near-infrared and Spitzer/IRAC photometry, and we find a (J-K)MKO color of 2.56 ± 0.13 mag-comparable to those observed in other young planetary-mass objects-and a luminosity of log(Lbol/L) = -4.75 ± 0.04 dex. We further re-assess the evidence for the young age of the host star, HD 203030, with a more comprehensive analysis of the photometry and updated stellar activity measurements and age calibrations. Summarizing the age diagnostics for both components of the binary, we adopt an age of 100 Myr for HD 203030B and an age range of 30-150 Myr. Using cloudy evolutionary models, the new companion age range and luminosity result in a mass of 11 MJup with a range of 8-15 MJup, and an effective temperature of 1040 ± 50 K.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): brown dwarfs - stars: evolution - stars: individual: (HD 203030, HD 203030B) - stars: individual: (HD 203030, HD 203030B)

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME GU Psc b BD* 01 12 35.0519481316 +17 03 55.571226067           T3.5 44 0
2 DENIS J025503.3-470049 BD* 02 55 03.6945042584 -47 00 51.345365454     22.921 19.906 17.454 L9 122 0
3 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 794 2
4 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2924 0
5 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2602 0
6 2MASSI J0825196+211552 BD* 08 25 19.6171008398 +21 15 51.565129705       21.97 19.22 L7.5V 102 0
7 IC 2391 OpC 08 40 32 -53 02.0           ~ 707 0
8 LP 261-75 B BD* 09 51 05.49 +35 58 02.1           L6V 40 0
9 TWA 42 BD* 11 19 32.543 -11 37 46.70           L7 22 0
10 2MASS J11472421-2040204 BD* 11 47 24.214 -20 40 20.44           L7V 14 0
11 VHS J1256-1257b BD* 12 56 01.83264 -12 57 27.6912           L8.0 27 0
12 VHS J1256-1257 LM* 12 56 02.15136 -12 57 21.7116     17.759   13.318 M7.0 21 0
13 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1085 1
14 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 1978 0
15 2MASS J21140802-2251358 BD* 21 14 08.026 -22 51 35.84           L7+1 69 0
16 V* V457 Vul BY* 21 18 58.2198227299 +26 13 49.956178408   9.19 8.43     K0V 66 0
17 HD 203030B BD* 21 18 58.97 +26 13 46.1           L7.5 53 0
18 HD 206860B BD* 21 44 28.47168 +14 46 07.7988           T2.5 77 0
19 HD 212734 * 22 26 04.2779066671 +25 55 39.490836158 7.160 7.100 7.050     A0 13 0
20 NAME IC 2391 Supercluster MGr ~ ~           ~ 8 0

    Equat.    Gal    SGal    Ecl

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2020.01.20-02:01:13

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