Copious Amounts of Hot and Cold Dust Orbiting the Main Sequence A-type Stars HD 131488 and HD 121191

Abstract

We report two new dramatically dusty main sequence stars: HD 131488 (A1V) and HD 121191 (A8V). HD 131488 is found to have substantial amounts of dust in its terrestrial planet zone (L_IR/L_bol~4x10^-3), cooler dust further out in its planetary system, and an unusual mid-infrared spectral feature. HD 121191 shows terrestrial planet zone dust (L_IR/L_bol~2.3x10^-3), hints of cooler dust, and shares the unusual mid-infrared spectral shape identified in HD 131488. These two stars belong to sub-groups of the Scorpius-Centaurus OB association and have ages of ~10 Myr. HD 131488 and HD 121191 are the dustiest main sequence A-type stars currently known. Early-type stars that host substantial inner planetary system dust are thus far found only within the age range of 5-20 Myr.

24 pages, 3 figures, 6 tables. Accepted for publication in ApJ

References in corpus (11)

• Debris Disk Evolution Around A Stars
• Spitzer IRS Spectroscopy of IRAS-Discovered Debris Disks
• Nearby debris disk systems with high fractional luminosity reconsidered
• Abundant Circumstellar Silica Dust and SiO Gas Created by a Giant Hypervelocity Collision in the ~12 Myr HD172555 System
• New Members of the Scorpius Centaurus Complex and Ages of its sub-regions
• Rapid disappearance of a warm, dusty circumstellar disk
• The Rise and Fall of Debris Disks: MIPS Observations of h and chi Persei and the Evolution of Mid-IR Emission from Planet Formation
• Warm dust in the terrestrial planet zone of a sun-like Pleiad: collisions between planetary embryos?
• Circumstellar Dust Created by Terrestrial Planet Formation in HD 113766
• A Spitzer MIPS Study of 2.5-2.0 M\odot Stars in Scorpius-Centaurus
• EF Cha: Warm Dust Orbiting a Nearby 10 Myr Old Star

Cited by in corpus (27)

• Molecular gas in debris disks around young A-type stars
• Five steps in the evolution from protoplanetary to debris disk
• A Comprehensive Census of Nearby Infrared Excess Stars
• Solution to the debris disc mass problem: planetesimals are born small?
• BANYAN. XII. New Members of Nearby Young Associations from Gaia-Tycho Data
• A large moving group within the Lower Centaurus Crux association
• A Census of the Circumstellar Disk Populations in the Sco-Cen Complex
• Survey of planetesimal belts with ALMA: gas detected around the Sun-like star HD 129590
• The co-existence of hot and cold gas in debris discs
• Circumstellar Debris Disks: Diagnosing the Unseen Perturber
• Primordial or Secondary? Testing models of debris disk gas with ALMA
• Herschel Observations of Dusty Debris Disks
• Follow-up Imaging of Disk Candidates from the Disk Detective Citizen Science Project: New Discoveries and False-Positives in WISE Circumstellar Disk Surveys
• Mid-infrared Studies of HD 113766 and HD 172555: Assessing Variability in the Terrestrial Zone of Young Exoplanetary Systems
• Warm Dusty Debris Disks and Distant Companion Stars: V488 Per and 2M1337
• 3D orbital architecture of a dwarf binary system and its planetary companion
• Spectral Evidence for an Inner Carbon-Rich Circumstellar Dust Belt in the Young HD36546 A-Star System
• Orphaned Exomoons: Tidal Detachment and Evaporation Following an Exoplanet-Star Collision
• Highly structured inner planetary system debris around the intermediate age Sun-like star TYC 8830 410 1
• Insights into planet formation from debris disks: I. The solar system as an archetype for planetesimal evolution
• Four new PLanetesimals Around TYpical and Pre-main seqUence Stars (PLATYPUS) Debris Discs at 8.8mm
• The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) IV: CO gas imaging and overview
• On the incidence of \textit{WISE} infrared excess among solar analog, twin and sibling stars
• A Data-Driven Search For Mid-Infrared Excesses Among Five Million Main-Sequence FGK Stars
• V488 Per revisited: no strong mid-infrared emission features and no evidence for stellar/sub-stellar companions
• Can the dustiest main sequence stars tell us about the rocky planet formation process?
• High CO/H2 ratios supports an exocometary origin for a CO-rich debris disk