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A UV-to-NIR Study of Molecular Gas in the Dust Cavity around RY Lupi

Arulanantham, N. and France, K. and Hoadley, K. and Manara, C. F. and Schneider, P. C. and Alcalá, J. M. and Banzatti, A. and Günther, H. M. and Miotello, A. and van der Marel, N. and van Dishoeck, E. F. and Walsh, C. and Williams, J. P. (2018) A UV-to-NIR Study of Molecular Gas in the Dust Cavity around RY Lupi. Astrophysical Journal, 855 (2). Art. No. 98. ISSN 1538-4357.

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We present a study of molecular gas in the inner disk (r < 20 au) around RY Lupi, with spectra from HST-COS, HST-STIS, and VLT-CRIRES. We model the radial distribution of flux from hot gas in a surface layer between r = 0.1–10 au, as traced by Lyα-pumped H_2. The result shows H_2 emission originating in a ring centered at ~3 au that declines within r < 0.1 au, which is consistent with the behavior of disks with dust cavities. An analysis of the H_2 line shapes shows that a two-component Gaussian profile (FWHM_(broad,H_2) = 105 ± 15 km s^(-1); FWHM_(narrow,H_2) = 43 ± 13 km s^(-1)) is statistically preferred to a single-component Gaussian. We interpret this as tentative evidence for gas emitting from radially separated disk regions (〈r_(broad,H_2)〉~ 0.4 ± 0.1 au;〈r_(narrow_H_2)〉 ~ 3 ± 2 au). The 4.7 μm ^(12)CO emission lines are also well fit by two-component profiles (〈r_(broad,CO)〉= 0.4 ± 0.1 au;〈r_(narrow,CO)〉 = 15 ± 2 au). We combine these results with 10 μm observations to form a picture of gapped structure within the mm-imaged dust cavity, providing the first such overview of the inner regions of a young disk. The HST SED of RY Lupi is available online for use in modeling efforts.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Arulanantham, N.0000-0003-2631-5265
France, K.0000-0002-1002-3674
Hoadley, K.0000-0002-8636-3309
Manara, C. F.0000-0003-3562-262X
Banzatti, A.0000-0003-4335-0900
van der Marel, N.0000-0003-2458-9756
van Dishoeck, E. F.0000-0001-7591-1907
Walsh, C.0000-0001-6078-786X
Williams, J. P.0000-0001-5058-695X
Additional Information:© 2018 The American Astronomical Society. Received 2017 November 20; revised 2018 February 12; accepted 2018 February 12; published 2018 March 12. We would like to thank the referee for their comments, which greatly enhanced the discussion presented here. We are also grateful to M. Tazzari, J.S. Pineda, R. Loomis, and K. Flaherty for helpful discussions about RY Lupi. This work was supported by HST-GO program 14469. N.A. is supported by NASA Earth and Space Science Fellowship grant 80NSSC17K0531. C.F.M. acknowledges support from an ESA Research Fellowship, and C.F.M. and A.M. acknowledge support from ESO Fellowships. Astrochemistry in Leiden is supported by the Netherlands Research School for Astronomy (NOVA), by a Royal Netherlands Academy of Arts and Sciences (KNAW) professor prize, and by the European Union A-ERC grant 291141 CHEMPLAN. A.B. acknowledges support by HST-GO program 14703. J.M.A. acknowledges financial support from the project PRIN-INAF 2016 The Cradle of Life—GENESIS-SKA (General Conditions in Early Planetary Systems for the rise of life with SKA). This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013; The Astropy Collaboration et al. 2018).
Funding AgencyGrant Number
Hubble Space Telescope14469
NASA Earth and Space Science Fellowship80NSSC17K0531
European Space Agency (ESA)UNSPECIFIED
European Southern Observatory (ESO)UNSPECIFIED
Nederlandse Onderzoekschool Voor Astronomie (NOVA)UNSPECIFIED
Royal Netherlands Academy of Arts and Sciences (KNAW)UNSPECIFIED
European Research Council (ERC)291141
Hubble Space Telescope14703
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Subject Keywords:ISM: molecules – protoplanetary disks – stars: pre-main sequence
Issue or Number:2
Record Number:CaltechAUTHORS:20180312-132704113
Persistent URL:
Official Citation:N. Arulanantham et al 2018 ApJ 855 98
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85250
Deposited By: Tony Diaz
Deposited On:12 Mar 2018 20:49
Last Modified:09 Mar 2020 13:19

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