First scattered-light images of the gas-rich debris disk around 49 Ceti

Abstract

We present the first scattered-light images of the debris disk around 49 ceti, a ~40 Myr A1 main sequence star at 59 pc, famous for hosting two massive dust belts as well as large quantities of atomic and molecular gas. The outer disk is revealed in reprocessed archival Hubble Space Telescope NICMOS F110W images, as well as new coronagraphic H band images from the Very Large Telescope SPHERE instrument. The disk extends from 1.1" (65 AU) to 4.6" (250 AU), and is seen at an inclination of 73degr, which refines previous measurements at lower angular resolution. We also report no companion detection larger than 3 M_Jup at projected separations beyond 20 AU from the star (0.34"). Comparison between the F110W and H-band images is consistent with a grey color of 49 ceti's dust, indicating grains larger than >2microns. Our photometric measurements indicate a scattering efficiency / infrared excess ratio of 0.2-0.4, relatively low compared to other characterized debris disks. We find that 49 ceti presents morphological and scattering properties very similar to the gas-rich HD 131835 system. From our constraint on the disk inclination we find that the atomic gas previously detected in absorption must extend to the inner disk, and that the latter must be depleted of CO gas. Building on previous studies, we propose a schematic view of the system describing the dust and gas structure around 49 ceti and hypothetic scenarios for the gas nature and origin.

Accepted for publication in ApJL. 7 pages, 4 figures

References in corpus (15)

• Fundamental limitations of high contrast imaging set by small sample statistics
• Molecular Gas Clumps from the Destruction of Icy Bodies in the $\beta$ Pictoris Debris Disk
• Probing for Exoplanets Hiding in Dusty Debris Disks: Disk Imaging, Characterization, and Exploration with HST/STIS Multi-Roll Coronagraphy
• Do Two Temperature Debris Disks Have Multiple Belts?
• Debris Disks in the Scorpius-Centaurus OB Association Resolved by ALMA
• Exocometary gas structure, origin and physical properties around $\beta$ Pictoris through ALMA CO multi-transition observations
• A Resolved Molecular Gas Disk around the Nearby A Star 49 Ceti
• Stirring in massive, young debris discs from spatially resolved Herschel images
• Five Debris Disks Newly Revealed in Scattered Light from the HST NICMOS Archive
• Gas and dust around A-type stars at tens of Myr:signatures of cometary breakup
• The Structure of the Local Interstellar Medium. VI. New MgII, FeII, and MnII Observations Toward Stars Within 100 Parsecs
• The SHARDDS survey: first resolved image of the HD114082 debris disk in Lower Centaurus Crux with SPHERE
• Volatile-Rich Circumstellar Gas in the Unusual 49 Ceti Debris Disk
• High-Resolution Imaging of the Dust Disk around 49 Ceti
• Archival Legacy Investigations of Circumstellar Environments: Overview and First Results

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