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

Jason J. Wang, Sivan Ginzburg, Bin Ren, Nicole Wallack, Peter Gao, Dimitri Mawet, Charlotte Z. Bond, Sylvain Cetre, Peter Wizinowich, Robert J. De Rosa, Garreth Ruane, Michael C. Liu (+33 others)
2020 Astronomical Journal  

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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%
more » ... 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 Jup . 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 Jup and a mean mass accretion rate between 3×10 −7 and 8×10 −7 M Jup /yr. For PDS 70 c, we computed a mass between 1 and 3 M Jup and mean mass accretion rate between 1×10 −7 and 5×10 −7 M Jup /yr. The mass accretion rates imply dust accretion timescales short enough to hide strong molecular absorption features in both planets' SEDs.
doi:10.3847/1538-3881/ab8aef fatcat:zh63w4src5gahcpdlg2euoleaq
Citation

Jason J. Wang, Sivan Ginzburg, Bin Ren, Nicole Wallack, Peter Gao, Dimitri Mawet, Charlotte Z. Bond, Sylvain Cetre, Peter Wizinowich, Robert J. De Rosa, Garreth Ruane, Michael C. Liu, Olivier Absil, Carlos Alvarez, Christoph Baranec, Élodie Choquet, Mark Chun, Denis Defrère, Jacques-Robert Delorme, Gaspard Duchêne, Pontus Forsberg, Andrea Ghez, Olivier Guyon, Donald N. B. Hall, Elsa Huby, Aïssa Jolivet, Rebecca Jensen-Clem, Nemanja Jovanovic, Mikael Karlsson, Scott Lilley, Keith Matthews, François Ménard, Tiffany Meshkat, Maxwell Millar-Blanchaer, Henry Ngo, Gilles Orban de Xivry, Christophe Pinte, Sam Ragland, Eugene Serabyn, Ernesto Vargas Catalán, Ji Wang, Ed Wetherell, Jonathan P. Williams, Marie Ygouf, Ben Zuckerman. "Keck/NIRC2 L'-band Imaging of Jovian-mass Accreting Protoplanets around PDS 70." Astronomical Journal 159.6 (2020) 263