2018A&A...617L...2M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:50:04

2018A&A...617L...2M - Astronomy and Astrophysics, volume 617, L2-2 (2018/9-1)

Orbital and atmospheric characterization of the planet within the gap of the PDS 70 transition disk.

MULLER A., KEPPLER M., HENNING T., SAMLAND M., CHAUVIN G., BEUST H., MAIRE A.-L., MOLAVERDIKHANI K., VAN BOEKEL R., BENISTY M., BOCCALETTI A., BONNEFOY M., CANTALLOUBE F., CHARNAY B., BAUDINO J.-L., GENNARO M., LONG Z.C., CHEETHAM A., DESIDERA S., FELDT M., FUSCO T., GIRARD J., GRATTON R., HAGELBERG J., JANSON M., LAGRANGE A.-M., LANGLOIS M., LAZZONI C., LIGI R., MENARD F., MESA D., MEYER M., MOLLIERE P., MORDASINI C., MOULIN T., PAVLOV A., PAWELLEK N., QUANZ S.P., RAMOS J., ROUAN D., SISSA E., STADLER E., VIGAN A., WAHHAJ Z., WEBER L. and ZURLO A.

Abstract (from CDS):


Context. The observation of planets in their formation stage is a crucial but very challenging step in understanding when, how, and where planets form. PDS 70 is a young pre-main sequence star surrounded by a transition disk, in the gap of which a planetary-mass companion has recently been discovered. This discovery represents the first robust direct detection of such a young planet, possibly still at the stage of formation.
Aims. We aim to characterize the orbital and atmospheric properties of PDS 70 b, which was first identified on May 2015 in the course of the SHINE survey with SPHERE, the extreme adaptive-optics instrument at the VLT.
Methods. We obtained new deep SPHERE/IRDIS imaging and SPHERE/IFS spectroscopic observations of PDS 70 b. The astrometric baseline now covers 6yr, which allowed us to perform an orbital analysis. For the first time, we present spectrophotometry of the young planet which covers almost the entire near-infrared range (0.96-3.8µm). We use different atmospheric models covering a large parameter space in temperature, log g, chemical composition, and cloud properties to characterize the properties of the atmosphere of PDS 70 b.
Results. PDS 70 b is most likely orbiting the star on a circular and disk coplanar orbit at ∼22au inside the gap of the disk. We find a range of models that can describe the spectrophotometric data reasonably well in the temperature range 1000-1600K and log g no larger than 3.5dex. The planet radius covers a relatively large range between 1.4 and 3.7 RJ with the larger radii being higher than expected from planet evolution models for the age of the planet of 5.4Myr.
Conclusions. This study provides a comprehensive data set on the orbital motion of PDS 70 b, indicating a circular orbit and a motion coplanar with the disk. The first detailed spectral energy distribution of PDS 70 b indicates a temperature typical of young giant planets. The detailed atmospheric analysis indicates that a circumplanetary disk may contribute to the total planetflux.

Abstract Copyright: © ESO 2018

Journal keyword(s): planets and satellites: atmospheres - planets and satellites: individual: PDS 70 - techniques: spectroscopic - astrometry - methods: observational

Simbad objects: 3

goto Full paper

goto View the reference in ADS

Number of rows : 3

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 CD-40 8434b Pl 14 08 10.1545137760 -41 23 52.576649494           ~ 50 0
2 CD-40 8434 TT* 14 08 10.1545137760 -41 23 52.576649494   13.42 12.18 11.71 10.506 K7IVe 119 0
3 * 51 Peg Ro* 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1071 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2018A&A...617L...2M and select 'bookmark this link' or equivalent in the popup menu


2020.07.04-02:50:04

© Université de Strasbourg/CNRS

    • Contact