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

Abstract

We present a study of molecular gas in the inner disk $\left(r<20\text{AU}\right)$ 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 Ly$\alpha$-pumped H${}_2$. The result shows H${}_2$ emission originating in a ring centered at $\sim$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 $\left({\text{FWHM}}_{broad,H_2}=105\pm 15{\text{km s}}^{-1};{\text{FWHM}}_{narrow,H_2}=43\pm 13{\text{km s}}^{-1}\right)$ is statistically preferred to a single-component Gaussian. We interpret this as tentative evidence for gas emitting from radially separated disk regions $\left(⟨r_{broad,H_2}⟩\sim 0.4\pm 0.1\text{AU};⟨r_{narrow,H_2}⟩\sim 3\pm 2\text{AU}\right)$. The 4.7 $\mu$m ${}^{12}$CO emission lines are also well fit by two-component profiles $\left(⟨r_{broad,CO}⟩=0.4\pm 0.1\text{AU};⟨r_{narrow,CO}⟩=15\pm 2\text{AU}\right)$. We combine these results with 10 $\mu$m 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.

arXiv commentAccepted for publication in ApJ

References in corpus (63)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• Disk Frequencies and Lifetimes in Young Clusters
• Protoplanetary Disks and Their Evolution
• First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• ALMA Survey of Lupus Protoplanetary Disks I: Dust and Gas Masses
• A Major Asymmetric Dust Trap in a Transition Disk
• Ringed Substructure and a Gap at 1 AU in the Nearest Protoplanetary Disk
• Dynamics of Protoplanetary Disks
• The Cosmic Origins Spectrograph
• X-Shooter spectroscopy of young stellar objects in Lupus: Accretion properties of class II and transitional objects
• Photoevaporation of Circumstellar Disks by FUV, EUV and X-ray Radiation from the Central Star
• An Old Disk That Can Still Form a Planetary System
• On the Diversity of the Taurus Transitional Disks: UX Tau A & Lk Ca 15
• Unveiling the Structure of Pre-Transitional Disks
• Time-Evolution of Viscous Circumstellar Disks due to Photoevaporation by FUV, EUV and X-ray Radiation from the Central Star
• C2D Spitzer-IRS spectra of disks around T Tauri stars: I. Silicate emission and grain growth
• Shadows cast by a warp in the HD 142527 protoplanetary disk
• Survival of molecular gas in cavities of transition disks (I. CO)
• The FUV spectrum of TW Hya. I. Observations of H${}_2$ Fluorescence
• Shadows and spirals in the protoplanetary disk HD 100453
• Protoplanetary disk masses from CO isotopologues line emission
• HST/COS Observations of the Ly alpha Forest toward the BL Lac Object 1ES1553+113
• The Far-Ultraviolet Spectra of TW Hya. II. Models of H2 Fluorescence in a Disk
• Mass measurements in protoplanetary disks from hydrogen deuteride
• The structure and dynamics of molecular gas in planet-forming zones: A CRIRES spectro-astrometric survey
• X-Shooter study of accretion in Chamaeleon I: II. A steeper increase of accretion with stellar mass for very low mass stars?
• Line Emission from Gas in Optically Thick Dust Disks around Young Stars
• A Multi-Ringed, Modestly-Inclined Protoplanetary Disk around AA Tau
• Determining protoplanetary disk gas masses from CO isotopologues line observations
• Gas structure inside dust cavities of transition disks: Oph IRS 48 observed by ALMA
• Young "Dipper" Stars in Upper Sco and $\rho$ Oph Observed by K2
• An ALMA Survey of CO isotopologue emission from Protoplanetary Disks in Chamaeleon I
• VLT-CRIRES Survey of Rovibrational CO Emission from Protoplanetary Disks
• Probing the Dust and Gas in the Transitional Disk of CS Cha with Spitzer
• CO rovibrational emission as a probe of inner disk structure
• Carbon isotope fractionation in protoplanetary disks
• A New Probe of the Planet-Forming Region in T Tauri Disks
• A Hubble Space Telescope Survey of H2 Emission in the Circumstellar Environments of Young Stars
• Confirmation of a gapped primordial disk around LkCa 15
• The Photoevaporative Wind from the Disk of TW Hya
• Single peaked CO emission line profiles from the inner regions of protoplanetary disks
• The Origins of Fluorescent H2 Emission From T Tauri~Stars
• An empirical sequence of disk gap opening revealed by rovibrational CO
• Formation, fractionation and excitation of carbon monoxide in diffuse clouds
• The depletion of water during dispersal of planet-forming disk regions
• Far-Ultraviolet H2 Emission from Circumstellar Disks
• Probing Protoplanetary Disks with Silicate Emission: Where is the silicate emission zone?
• Lyman alpha dominance of the Classical T Tauri FUV Radiation Field
• Connecting the shadows: probing inner disk geometries using shadows in transitional disks
• CO/H2 Abundance Ratio ~ 10^{-4} in a Protoplanetary Disk
• The Far-Ultraviolet "Continuum" in Protoplanetary Disk Systems II: CO Fourth Positive Emission and Absorption
• Shielding by Water and OH in FUV and X-ray Irradiated Protoplanetary Disks
• Constraints on the disk geometry of the T Tauri star AA Tau from linear polarimetry
• The Far-Ultraviolet "Continuum" in Protoplanetary Disk Systems I: Electron-Impact H2 and Accretion Shocks
• Observing the linked depletion of dust and CO gas at 0.1-10 au in disks of intermediate-mass stars
• Characterizing CO Fourth Positive Emission in Young Circumstellar Disks
• The 1600 Angstrom Emission Bump in Protoplanetary Disks: A Spectral Signature of H${}_2$O Dissociation
• Herschel-PACS observations of far-IR lines in YSOs I: [OI] and H2O at 63 microns
• The Evolution of Inner Disk Gas in Transition Disks
• FUV Irradiated Disk Atmospheres: Ly$\alpha$ and the Origin of Hot H${}_2$ Emission
• Probing the Inner Regions of Protoplanetary Disks with CO Absorption Line Spectroscopy

Cited by in corpus (13)

• Hints for icy pebble migration feeding an oxygen-rich chemistry in the inner planet-forming region of disks
• PENELLOPE: the ESO data legacy program to complement the Hubble UV Legacy Library of Young Stars (ULLYSES) I. Survey presentation and accretion properties of Orion OB1 and $\sigma$-Orionis
• Warping a protoplanetary disc with a planet on an inclined orbit
• HST spectra reveal accretion in MY Lupi
• The ODYSSEUS Survey. Motivation and First Results: Accretion, Ejection, and Disk Irradiation of CVSO 109
• The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN
• The UV Perspective of Low-Mass Star Formation
• The Radial Distribution and Excitation of H2 around Young Stars in the HST-ULLYSES Survey
• Probing UV-Sensitive Pathways for CN and HCN Formation in Protoplanetary Disks with the Hubble Space Telescope
• UV Fluorescence Traces Gas and LyA Evolution in Protoplanetary Disks
• Detection of H${}_2$ in the TWA 7 System: A Probable Circumstellar Origin
• Evidence of a Disk-wind Origin for Fluorescent H${}_2$ in Classical T Tauri Stars
• Updated Ultraviolet Fluorescence Efficiencies of CS: Evidence for Model Discrepancies in the Enhancement of NUV-Derived CS Abundances in Comets