The Surprisingly Low Carbon Mass in the Debris Disk around HD 32297

被引：24

作者：

Cataldi, Gianni ^{[1
,2
,3
,4
,5
]}

Wu, Yanqin ^{[1
]}

Brandeker, Alexis ^{[6
]}

Ohashi, Nagayoshi ^{[2
]}

Moor, Attila ^{[5
,7
]}

Olofsson, Goran ^{[6
]}

Abraham, Peter ^{[5
,7
]}

Asensio-Torres, Ruben ^{[6
]}

Cavallius, Maria ^{[6
]}

Dent, William R. F. ^{[8
]}

Grady, Carol ^{[9
]}

Henning, Thomas ^{[10
]}

Higuchi, Aya E. ^{[3
]}

Hughes, A. Meredith ^{[11
,12
]}

Janson, Markus ^{[6
]}

Kamp, Inga ^{[13
]}

Kospal, Agnes ^{[5
,7
,10
]}

Redfield, Seth ^{[11
,12
]}

Roberge, Aki ^{[14
]}

Weinberger, Alycia ^{[15
]}

Welsh, Barry ^{[16
]}

机构：

[1] Univ Toronto, Dept Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada

[2] Natl Astron Observ Japan, Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA

[3] Natl Astron Observ Japan, Osawa 2-21-1, Mitaka, Tokyo 1818588, Japan

[4] Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[5] Res Ctr Astron & Earth Sci, Konkoly Observ, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary

[6] Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, SE-10691 Stockholm, Sweden

[7] Eotvos Lorand Univ, Inst Phys, Pazmany Peter Setany 1-A, H-1117 Budapest, Hungary

[8] ALMA Santiago Cent Off, Alonso de Cordova 3107, Santiago, Chile

[9] Eureka Sci, 2452 Delmer,Suite 100, Oakland, CA 94602 USA

[10] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[11] Wesleyan Univ, Astron Dept, 96 Foss Hill Dr, Middletown, CT 06459 USA

[12] Wesleyan Univ, Van Vleck Observ, 96 Foss Hill Dr, Middletown, CT 06459 USA

[13] Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands

[14] NASA, Exoplanets & Stellar Astrophys Lab, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[15] Carnegie Inst Sci, Dept Terr Magnetism, 5241 Broad Branch Rd NW, Washington, DC 20015 USA

[16] Univ Calif Berkeley, Space Sci Lab, 7 Gauss Way, Berkeley, CA 94720 USA

来源：

ASTROPHYSICAL JOURNAL | 2020年 / 892卷 / 02期

基金：

欧洲研究理事会;

关键词：

Exoplanet formation; Submillimeter astronomy; Radio interferometry; Atomic spectroscopy; Debris disks; Circumstellar gas; ELECTRON-ION RECOMBINATION; BETA-PICTORIS; EXOCOMETARY GAS; DUST; CO; COEFFICIENTS; ORIGIN; GRAINS; STARS; RING;

D O I：

10.3847/1538-4357/ab7cc7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Gas has been detected in a number of debris disks. It is likely secondary, i.e., produced by colliding solids. Here, we report ALMA Band 8 observations of neutral carbon in the CO-rich debris disk around the 15-30 Myr old A-type star HD 32297. We find that C-0 is located in a ring at similar to 110 au with an FWHM of similar to 80 au and has a mass of (3.5 0.2) x 10(-3) M-circle plus. Naively, such a surprisingly small mass can be accumulated from CO photodissociation in a time as short as similar to 10(4) yr. We develop a simple model for gas production and destruction in this system, properly accounting for CO self-shielding and shielding by neutral carbon, and introducing a removal mechanism for carbon gas. We find that the most likely scenario to explain both C-0 and CO observations is one where the carbon gas is rapidly removed on a timescale of order a thousand years and the system maintains a very high CO production rate of similar to 15 M-circle plus Myr(-1), much higher than the rate of dust grind-down. We propose a possible scenario to meet these peculiar conditions: the capture of carbon onto dust grains, followed by rapid CO re-formation and rerelease. In steady state, CO would continuously be recycled, producing a CO-rich gas ring that shows no appreciable spreading over time. This picture might be extended to explain other gas-rich debris disks.

引用

页数：15

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