Keck/NIRC2 L'-band Imaging of Jovian-mass Accreting Protoplanets around PDS 70 - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astronomical Journal Year : 2020

Keck/NIRC2 L'-band Imaging of Jovian-mass Accreting Protoplanets around PDS 70

Ben Zuckerman
  • Function : Author
Marie Ygouf
Jonathan P. Williams
  • Function : Author
Ed Wetherell
  • Function : Author
Ji Wang
  • Function : Author
Ernesto Vargas Catalán
  • Function : Author
Eugene Serabyn
  • Function : Author
Sam Ragland
  • Function : Author
Gilles Orban de Xivry
  • Function : Author
Henry Ngo
Maxwell Millar-Blanchaer
Tiffany Meshkat
  • Function : Author
Keith Matthews
  • Function : Author
Scott Lilley
  • Function : Author
Mikael Karlsson
  • Function : Author
Nemanja Jovanovic
Rebecca Jensen-Clem
Aïssa Jolivet
  • Function : Author
Donald N. B. Hall
  • Function : Author
Olivier Guyon
Andrea Ghez
  • Function : Author
Pontus Forsberg
  • Function : Author
Jacques-Robert Delorme
  • Function : Author
Denis Defrère
  • Function : Author
Mark Chun
  • Function : Author
Élodie Choquet
Christoph Baranec
  • Function : Author
Carlos Alvarez
  • Function : Author
Olivier Absil
Michael C. Liu
  • Function : Author
Garreth Ruane
  • Function : Author
Robert J. de Rosa
  • Function : Author
Peter Wizinowich
  • Function : Author
Sylvain Cetre
  • Function : Author
Charlotte Z. Bond
  • Function : Author
Dimitri Mawet
Peter Gao
  • Function : Author
Nicole Wallack
  • Function : Author
Bin Ren
  • Function : Author
Sivan Ginzburg
  • Function : Author
Jason J. Wang
  • Function : Author

Abstract

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 RJup. 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 MJup and a mean mass accretion rate between 3 × 10-7 and 8 × 10-7 MJup/yr. For PDS 70 c, we computed a mass between 1 and 3 MJup and mean mass accretion rate between 1 × 10-7 and 5 × 10-7 MJup/yr. The mass accretion rates imply dust accretion timescales short enough to hide strong molecular absorption features in both planets' SEDs.

Dates and versions

insu-03667095 , version 1 (13-05-2022)

Identifiers

Cite

Ben Zuckerman, Marie Ygouf, Jonathan P. Williams, Ed Wetherell, Ji Wang, et al.. Keck/NIRC2 L'-band Imaging of Jovian-mass Accreting Protoplanets around PDS 70. The Astronomical Journal, 2020, 159, ⟨10.3847/1538-3881/ab8aef⟩. ⟨insu-03667095⟩
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