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arxiv: 1308.2753 · v1 · pith:5L4QAMFOnew · submitted 2013-08-13 · 🌌 astro-ph.SR · astro-ph.EP

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

Carl Melis , B. Zuckerman , Joseph H. Rhee , Inseok Song , Simon J. Murphy , Michael S. Bessell This is my paper
classification 🌌 astro-ph.SR astro-ph.EP
keywords duststarsmainsequencea-typeamountscoolerfound
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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.

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