Spectroscopic Confirmation Of Young Planetary-Mass Companions On Wide Orbits

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dc.contributor.utaustinauthorKraus, Adam L.en_US
dc.contributor.utaustinauthorMann, Andrew W.en_US
dc.creatorBowler, Brendan P.en_US
dc.creatorLiu, Michael C.en_US
dc.creatorKraus, Adam L.en_US
dc.creatorMann, Andrew W.en_US
dc.date.accessioned2016-04-28T19:31:38Z
dc.date.available2016-04-28T19:31:38Z
dc.date.issued2014-03en
dc.description.abstractWe present moderate-resolution ( R similar to 4000-5000) near-infrared integral field spectroscopy of the young (1-5 Myr) 6-14 M-Jup companions ROXs 42B b and FW Tau b obtained with Keck/OSIRIS and Gemini-North/NIFS. The spectrum of ROXs 42B b exhibits clear signs of low surface gravity common to young L dwarfs, confirming its extreme youth, cool temperature, and low mass. Overall, it closely resembles the free-floating 4-7 M-Jup L-type Taurus member 2MASS J04373705+2331080. The companion to FW Tau AB is more enigmatic. Our optical and near-infrared spectra show strong evidence of outflow activity and disk accretion in the form of line emission from [S II], [O I], H alpha, Ca II, [Fe II], Pa beta, and H-2. The molecular hydrogen emission is spatially resolved as a single lobe that stretches approximate to 0 ''.1 (15 AU). Although the extended emission is not kinematically resolved in our data, its morphology resembles shock-excited H-2 jets primarily seen in young Class 0 and Class I sources. The near-infrared continuum of FW Tau b is mostly flat and lacks the deep absorption features expected for a cool, late-type object. This may be a result of accretion-induced veiling, especially in light of its strong and sustained Ha emission (EW(H alpha)greater than or similar to 290 angstrom). Alternatively, FW Tau b may be a slightly warmer (M5-M8) accreting low-mass star or brown dwarf (0.03-0.15 M circle dot) with an edge-on disk. Regardless, its young evolutionary stage is in stark contrast to its Class III host FW Tau AB, indicating a more rapid disk clearing timescale for the host binary system than for its wide companion. Finally, we present near-infrared spectra of the young (similar to 2-10 Myr) low-mass (12-15 M-Jup) companions GSC 6214-210 B and SR 12 C and find they best resemble low- gravity M9.5 and M9 substellar templates.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASA NNX11AC31Gen_US
dc.description.sponsorshipNSF AST09-09222en_US
dc.identifierdoi:10.15781/T2KB96
dc.identifier.Filename2014_03_spectroscopic.pdfen_US
dc.identifier.citationBowler, Brendan P., Michael C. Liu, Adam L. Kraus, and Andrew W. Mann. "Spectroscopic Confirmation of Young Planetary-mass Companions on Wide Orbits." The Astrophysical Journal, Vol. 784, No. 1 (Mar., 2014): 65.en_US
dc.identifier.doi10.1088/0004-637x/784/1/65en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34644
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectbrown dwarfsen_US
dc.subjectplanetary systemsen_US
dc.subjectstars: individual (roxs 42b, fw tau,en_US
dc.subjectgsc 6214-210, sr 12)en_US
dc.subjectstars: low-massen_US
dc.subjectt-tauri starsen_US
dc.subjectvery-low massen_US
dc.subjectnear-infrared spectroscopyen_US
dc.subjectextrasolaren_US
dc.subjectgiant planetsen_US
dc.subjecthubble-space-telescopeen_US
dc.subjectmain-sequence starsen_US
dc.subjectclass-ien_US
dc.subjectprotostarsen_US
dc.subjectedge-on disken_US
dc.subjectsupernova factory observationsen_US
dc.subjectintegral fielden_US
dc.subjectspectrographen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleSpectroscopic Confirmation Of Young Planetary-Mass Companions On Wide Orbitsen_US
dc.typeArticleen_US

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