2014A&A...567L...9B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST15:12:41

2014A&A...567L...9B - Astronomy and Astrophysics, volume 567, L9-9 (2014/7-1)

Physical and orbital properties of β Pictoris b.

BONNEFOY M., MARLEAU G.-D., GALICHER R., BEUST H., LAGRANGE A.-M., BAUDINO J.-L., CHAUVIN G., BORGNIET S., MEUNIER N., RAMEAU J., BOCCALETTI A., CUMMING A., HELLING C., HOMEIER D., ALLARD F. and DELORME P.

Abstract (from CDS):

The intermediate-mass star {beta} Pictoris is known to be surrounded by a structured edge-on debris disk within which a gas giant planet was discovered orbiting at 8-10AU. The physical properties of {beta} Pic b were previously inferred from broad- and narrow-band 0.9-4.8µm photometry. We used commissioning data of the Gemini Planet Imager (GPI) to obtain new astrometry and a low-resolution (R∼35-39) J-band (1.12-1.35µm) spectrum of the planet. We find that the planet has passed the quadrature. We constrain its semi-major axis to ≤10AU (90% prob.) with a peak at 8.9+0.4–0.6AU. The joint fit of the planet astrometry and the most recent radial velocity measurements of the star yields a planet dynamical mass lower than 20MJup (≥96% prob.). The extracted spectrum of β Pic b is similar to those of young L1–1.5+1 dwarfs. We used the spectral type estimate to revise the planet luminosity to log(L/L)=-3.90±0.07. The 0.9-4.8µm photometry and spectrum are reproduced for Teff=1650±150K and a logg ≤4.7dex by 12 grids of PHOENIX-based and LESIA atmospheric models. For the most recent system age estimate (21±4Myr), the bolometric luminosity and the constraints on the dynamical mass of β Pic b are only reproduced by warm- and hot-start tracks with initial entropies Si>10.5kB/baryon. These initial conditions may result from an inefficient accretion shock and/or a planetesimal density at formation higher than in the classical core-accretion model. Considering a younger age for the system or a conservative formation time for β Pic b does not change these conclusions.

Abstract Copyright:

Journal keyword(s): techniques: photometric - techniques: spectroscopic - planetary systems - stars: individual: β Pic

Simbad objects: 5

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Number of rows : 5

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 2MASS J01174748-3403258 BD* 01 17 47.4932550807 -34 03 25.819621153       21.040 18.825 L1gamma 23 0
2 2MASS J01415823-4633574 BD* 01 41 58.2345784233 -46 33 57.347491326           L0gamma 62 0
3 [BLH2002] KPNO-Tau 4 BD* 04 27 27.9997171623 +26 12 05.097974406     24.722 20.54 18.75 L0 65 0
4 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1653 1
5 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 338 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-15:12:41

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