Detection of a Molecular Disk Orbiting the Nearby, "Old," Classical T Tauri Star MP Mus

Abstract

We have used the Atacama Pathfinder Experiment 12 m telescope to detect circumstellar CO emission from MP Mus (K1 IVe), a nearby (D ~ 100 pc), actively accreting, ~7 Myr-old pre-main sequence (pre-MS) star. The CO emission line profile measured for MP Mus is indicative of an orbiting disk with radius ~120 AU, assuming the central star mass is 1.2 solar masses and the disk inclination is ~30 degrees, and the inferred disk molecular gas mass is ~3 Earth masses. MP Mus thereby joins TW Hya and V4046 Sgr as the only late-type (low-mass), pre-MS star systems within ~100 pc of Earth that are known to retain orbiting, molecular disks. We also report the nondetection (with the Institut de Radio Astronomie Millimetrique 30 m telescope) of CO emission from another ten nearby (D ~ 100 pc or less), dusty, young (age ~10-100 Myr) field stars of spectral type A-G. We discuss the implications of these results for the timescales for stellar and Jovian planet accretion from, and dissipation of, molecular disks around young stars.

12 pages, 1 figure; to appear in Astrophys. J. (Letters)

References in corpus (11)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Spitzer/MIPS Observations of Stars in the Beta Pictoris Moving Group
• X-ray emission from MP Muscae: an old classical T Tauri star
• Herschel-PACS observation of the 10 Myr old T Tauri disk TW Hya: Constraining the disk gas mass
• The Age of the HD 15407 System and the Epoch of Final Catastrophic Mass Accretion onto Terrestrial Planets around Sun-like Stars
• X-ray accretion signatures in the close CTTS binary V4046 Sgr
• Evidence for Accretion in the High-resolution X-ray Spectrum of the T Tauri Star System Hen 3-600
• Imaging the Molecular Disk Orbiting the Twin Young Suns of V4046 Sgr
• Molecules in the disk orbiting the twin young suns of V4046 Sgr
• Gas and Dust Associated with the Strange, Isolated, Star BP Piscium
• Molecules in the Circumstellar Disk Orbiting BP Piscium

Cited by in corpus (23)

• Disks ARound TTauri Stars with Sphere (DARTTS-S) I: Sphere / IRDIS Polarimetric Imaging of 8 prominent TTauri Disks
• Probing for Exoplanets Hiding in Dusty Debris Disks: Disk Imaging, Characterization, and Exploration with HST/STIS Multi-Roll Coronagraphy
• A 40 Myr Old Gaseous Circumstellar Disk at 49 Ceti: Massive CO-Rich Comet Clouds at Young A-Type Stars
• Understanding the origin of the [OI] low-velocity component from T Tauri stars
• The Structure of the Evolved Circumbinary Disk around V4046 Sgr
• Hot Gas Lines in T Tauri Stars
• A Comprehensive Census of Nearby Infrared Excess Stars
• Molecular gas in young debris disks
• High resolution spectroscopy of Ne II emission from young stellar objects
• The Evolution of Disk Winds from a Combined Study of Optical and Infrared Forbidden Lines
• The CN/C15 N isotopic ratio towards dark clouds
• The hybrid disks: a search and study to better understand evolution of disks
• A Subarcsecond ALMA Molecular Line Imaging Survey of the Circumbinary, Protoplanetary Disk Orbiting V4046 Sgr
• The PDS 66 Circumstellar Disk as seen in Polarized Light with the Gemini Planet Imager
• The Giant Accreting Protoplanet Survey (GAPlanetS) -- Results from a Six Year Campaign to Image Accreting Protoplanets
• The ALMA view of MP Mus (PDS 66): a protoplanetary disk with no visible gaps down to 4 au scales
• Gaia-based Isochronal, Kinematic, and Spatial Analysis of the $\epsilon$ Cha Association
• An ALMA Survey for Disks Orbiting Low-Mass Stars in the TW Hya Association
• Discovery of Resolved Debris Disk Around HD 131835
• Molecules in the transition disk orbiting T Cha
• An Unbiased 1.3 mm Emission Line Survey of the Protoplanetary Disk Orbiting LkCa 15
• Confirmation of a ring structure in the disk around MP Mus (PDS 66) with ALMA Band 7 observations
• Nearby Young Stars and Young Moving Groups