Gas and dust around A-type stars at tens of Myr: signatures of cometary breakup

被引：38

作者：

Greaves, J. S. ^{[1
]}

Holland, W. S. ^{[2
]}

Matthews, B. C. ^{[3
]}

Marshall, J. P. ^{[4
]}

Dent, W. R. F. ^{[5
]}

Woitke, P. ^{[6
]}

Wyatt, M. C. ^{[7
]}

Matra, L. ^{[7
]}

Jackson, A. ^{[8
]}

机构：

[1] Cardiff Univ, Sch Phys & Astron, 4 Parade, Cardiff CF24 3AA, S Glam, Wales

[2] Royal Observ, Astron Technol Ctr, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[3] Natl Res Council Canada, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada

[4] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia

[5] ALMA Santiago Cent Off, Alonso de Crdova 3107,Casilla 7630355, Santiago, Chile

[6] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

[7] Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[8] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 461卷 / 04期

基金：

英国科学技术设施理事会;

关键词：

planetary systems; circumstellar matter; infrared: stars; 32297 DEBRIS DISK; MOLECULAR GAS; PLANET FORMATION; BETA-PICTORIS; YOUNG STARS; SELF-CONSISTENT; HD; 21997; EVOLUTION; ALMA; VEGA;

D O I：

10.1093/mnras/stw1569

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Discs of dusty debris around main-sequence stars indicate fragmentation of orbiting planetesimals, and for a few A-type stars, a gas component is also seen that may come from collisionally released volatiles. Here we find the sixth example of a CO-hosting disc, around the similar to 30 Myr-old A0-star HD 32997. Two more of these CO-hosting stars, HD 21997 and 49 Cet, have also been imaged in dust with SCUBA-2 within the SCUBA-2 Survey of Nearby Stars project. A census of 27 A-type debris hosts within 125 pc now shows 7/16 detections of carbon-bearing gas within the 5-50 Myr epoch, with no detections in 11 older systems. Such a prolonged period of high fragmentation rates corresponds quite well to the epoch when most of the Earth was assembled from planetesimal collisions. Recent models propose that collisional products can be spatially asymmetric if they originate at one location in the disc, with CO particularly exhibiting this behaviour as it can photodissociate in less than an orbital period. Of the six CO-hosting systems, only beta Pic is in clear support of this hypothesis. However, radiative transfer modelling with the ProDiMo code shows that the CO is also hard to explain in a proto-planetary disc context.

引用

页码：3910 / 3917

页数：8

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