[en] We present L'-band imaging of the PDS 70 planetary system with Keck/NIRC2 using the new infrared pyramid wave front sensor. We detected both PDS 70 b and c in our images, as well as the front rim of the circumstellar disk. After subtracting off a model of the disk, we measured the astrometry and photometry of both planets. Placing priors based on the dynamics of the system, we estimated PDS 70 b to have a semimajor axis of ${20}_{-4}^{+3}$ au and PDS 70 c to have a semimajor axis of ${34}_{-6}^{+12}$ au (95% credible interval). We fit the spectral energy distribution (SED) of both planets. For PDS 70 b, we were able to place better constraints on the red half of its SED than previous studies and inferred the radius of the photosphere to be 2-3 R[SUB]Jup[/SUB]. The SED of PDS 70 c is less well constrained, with a range of total luminosities spanning an order of magnitude. With our inferred radii and luminosities, we used evolutionary models of accreting protoplanets to derive a mass of PDS 70 b between 2 and 4 M[SUB]Jup[/SUB] and a mean mass accretion rate between 3 × 10[SUP]-7[/SUP] and 8 × 10[SUP]-7[/SUP] M[SUB]Jup[/SUB]/yr. For PDS 70 c, we computed a mass between 1 and 3 M[SUB]Jup[/SUB] and mean mass accretion rate between 1 × 10[SUP]-7[/SUP] and 5 × 10[SUP]-7[/SUP] M[SUB]Jup[/SUB]/yr. The mass accretion rates imply dust accretion timescales short enough to hide strong molecular absorption features in both planets' SEDs.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Wang, Jason J.; 51 Pegasi b Fellow. ; Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
Ginzburg, Sivan; 51 Pegasi b Fellow. ; Department of Astronomy, University of California at Berkeley, CA 94720, USA
Ren, Bin; Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
Wallack, Nicole; Division of Geological & Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
Gao, Peter; 51 Pegasi b Fellow. ; Department of Astronomy, University of California at Berkeley, CA 94720, USA
Mawet, Dimitri; Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA ; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr.,Pasadena, CA 91109, USA
Bond, Charlotte Z.; Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA ; W.M. Keck Observatory, 65-1120 Mamalahoa Hwy, Kamuela, HI, USA
Baranec, Christoph; Institute for Astronomy, University of Hawai'i at Mānoa, 640 North A'ohoku Place, Hilo, HI 96720-2700, USA
Choquet, Élodie; Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France
Chun, Mark; Institute for Astronomy, University of Hawai'i at Mānoa, 640 North A'ohoku Place, Hilo, HI 96720-2700, USA
Defrere, Denis ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Delorme, Jacques-Robert; Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
Duchêne, Gaspard; Department of Astronomy, University of California at Berkeley, CA 94720, USA ; Université Grenoble-Alpes, CNRS Institut de Planétologie et d'Astrophysique (IPAG), F-38000 Grenoble, France
Forsberg, Pontus; Department of Materials Science and Engineering, Ångström Laboratory, Uppsala University, Box 534, 751 21, Uppsala, Sweden
Ghez, Andrea; Department of Physics & Astronomy, 430 Portola Plaza, University of California, Los Angeles, CA 90095, USA
Guyon, Olivier; Subaru Telescope, National Astronomical Observatory of Japan, 650 North Aohoku Place, Hilo, HI 96720, USA ; Steward Observatory, University of Arizona, Tucson, AZ 85721, USA ; Astrobiology Center of NINS, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Hall, Donald N. B.; Institute for Astronomy, University of Hawai'i at Mānoa, 640 North A'ohoku Place, Hilo, HI 96720-2700, USA
Huby, Elsa; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 place Jules Janssen, 92195 Meudon, France
Jolivet, Aïssa ; Université de Liège - ULiège > Département de physique > Optique - Hololab
Jensen-Clem, Rebecca; Department of Astronomy & Astrophysics, University of California, Santa Cruz, CA95064, USA
Jovanovic, Nemanja; Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
Karlsson, Mikael; Department of Materials Science and Engineering, Ångström Laboratory, Uppsala University, Box 534, 751 21, Uppsala, Sweden
Matthews, Keith; Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
Ménard, François; Université Grenoble-Alpes, CNRS Institut de Planétologie et d'Astrophysique (IPAG), F-38000 Grenoble, France
Meshkat, Tiffany; IPAC, California Institute of Technology, M/C 100-22, 1200 East California Boulevard, Pasadena, CA 91125, USA
Millar-Blanchaer, Maxwell; Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA ; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr.,Pasadena, CA 91109, USA
Ngo, Henry; NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, British Columbia, Canada
Orban De Xivry, Gilles ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Pinte, Christophe; Université Grenoble-Alpes, CNRS Institut de Planétologie et d'Astrophysique (IPAG), F-38000 Grenoble, France ; Monash Centre for Astrophysics (MoCA) and School of Physics and Astronomy, Monash University, Clayton Vic 3800, Australia
