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    Magellan Adaptive Optics Imaging of PDS 70: Measuring the Mass Accretion Rate of a Young Giant Planet within a Gapped Disk

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    Wagner_2018_ApJL_863_L8.pdf
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    Final Published version
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    Author
    Wagner, Kevin cc
    Follete, Katherine B.
    Close, Laird M. cc
    Apai, Dániel cc
    Gibbs, Aidan
    Keppler, Miriam
    Müller, André
    Henning, Thomas
    Kasper, Markus
    Wu, Ya-Lin cc
    Long, Joseph
    Males, Jared
    Morzinski, Katie
    McClure, Melissa
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    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2018-08-10
    Keywords
    planet-disk interactions
    planets and satellites: detection
    planets and satellites: formation
    stars: pre-main sequence
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Kevin Wagner et al 2018 ApJL 863 L8
    Journal
    ASTROPHYSICAL JOURNAL LETTERS
    Rights
    © 2018. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    PDS 70b is a recently discovered and directly imaged exoplanet within the wide (greater than or similar to 40 au) cavity around PDS 70. Ongoing accretion onto the central star suggests that accretion onto PDS 70b may also be ongoing. We present the first high-contrast images at H alpha (656 nm) and nearby continuum (643 nm) of PDS 70 utilizing the MagAO system. The combination of these filters allows for the accretion rate of the young planet to be inferred, as hot infalling hydrogen gas will emit strongly at H alpha over the optical continuum. We detected a source in H alpha at the position of PDS 70b on two sequential nights in 2018 May, for which we establish a false positive probability of <0.1%. We conclude that PDS 70b is a young, actively accreting planet. We utilize the H alpha line luminosity to derive a mass accretion rate of (M) over dot = 10(-8 +/- 1) M-Jup yr(-1), where the large uncertainty is primarily due to the unknown amount of optical extinction from the circumstellar and circumplanetary disks. PDS 70b represents the second case of an accreting planet interior to a disk gap, and is among the early examples of a planet observed during its formation.
    ISSN
    2041-8213
    DOI
    10.3847/2041-8213/aad695
    Version
    Final published version
    Sponsors
    NASA's Science Mission Directorate; NASA Exoplanets Research Program [NNX16AD44G]; DFG priority program [SPP 1992, MU 4172/1-1]; NSF ATI [1506818]; NSF AAG program [1615408]; NASA XRP program [80NSSC18K0441]
    Additional Links
    http://stacks.iop.org/2041-8205/863/i=1/a=L8?key=crossref.0e80dcceb3e83e0b3fe3b60896cfbd26
    ae974a485f413a2113503eed53cd6c53
    10.3847/2041-8213/aad695
    Scopus Count
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