JWST/MIRI Spectroscopy of the Disk of the Young Eruptive Star EX Lup in Quiescence

被引：36

作者：

Kospal, Agnes ^{[1
,2
,3
,4
]}

Abraham, Peter ^{[1
,2
,4
]}

Diehl, Lindsey ^{[5
]}

Banzatti, Andrea ^{[5
]}

Bouwman, Jeroen ^{[3
]}

Chen, Lei ^{[1
,2
]}

de Miera, Fernando Cruz-Saenz ^{[1
,2
]}

Green, Joel D. ^{[6
,7
]}

Henning, Thomas ^{[3
]}

Rab, Christian ^{[8
,9
]}

机构：

[1] Eotvos Lorand Res Network ELKH, Res Ctr Astron & Earth Sci, Konkoly Observ, Konkoly Thege Mikl Ut 15-17, H-1121 Budapest, Hungary

[2] MTA Ctr Excellence, CSFK, Konkoly Thege Mikl Ut 15-17, H-1121 Budapest, Hungary

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

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

[5] Texas State Univ, Dept Phys, 749 N Comanche St, San Marcos, TX 78666 USA

[6] Univ Texas Austin, Dept Astron, 2515 Speedway,Stop C1400, Austin, TX 78712 USA

[7] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 02138 USA

[8] Ludwig Maximilians Univ Munchen, Univ Observ, Fac Phys, Scheinerstr 1, D-81679 Munich, Germany

[9] Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2023年 / 945卷 / 01期

基金：

欧洲研究理事会;

关键词：

T-TAURI STARS; INTERSTELLAR SILICATE MINERALOGY; MIDINFRARED MOLECULAR-EMISSION; SPITZER IRS SPECTRA; PROTOPLANETARY DISKS; ORGANIC-MOLECULES; DUST; OUTBURST; WATER; GAS;

D O I：

10.3847/2041-8213/acb58a

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

EX Lup is a low-mass pre-main-sequence star that occasionally shows accretion-related outbursts. Here, we present JWST/MIRI medium-resolution spectroscopy obtained for EX Lup 14 yr after its powerful outburst. EX Lup is now in quiescence and displays a Class II spectrum. We detect a forest of emission lines from molecules previously identified in infrared spectra of classical T Tauri disks: H2O, OH, H-2, HCN, C2H2, and CO2. The detection of organic molecules demonstrates that they are back after disappearing during the large outburst. Spectral lines from water and OH are for the first time deblended and will provide a much-improved characterization of their distribution and density in the inner disk. The spectrum also shows broad emission bands from warm, submicron-size amorphous silicate grains at 10 and 18 mu m. During the outburst, in 2008, crystalline forsterite grains were annealed in the inner disk within 1 au, but their spectral signatures in the 10 mu m silicate band later disappeared. With JWST we rediscovered these crystals via their 19.0, 20.0, and 23.5 mu m emission, the strength of which implies that the particles are at similar to 3 au from the star. This suggests that crystalline grains formed in 2008 were transported outwards and now approach the water snowline, where they may be incorporated into planetesimals. Containing several key tracers of planetesimal and planet formation, EX Lup is an ideal laboratory to study the effects of variable luminosity on the planet-forming material and may provide an explanation for the observed high crystalline fraction in solar system comets.

引用

页数：7

共 49 条

[11] ORGANIC MOLECULES AND WATER IN THE INNER DISKS OF T TAURI STARS [J].

Carr, John S. ;

Najita, Joan R. .

ASTROPHYSICAL JOURNAL, 2011, 733 (02)

[12] Imaging the water snow-line during a protostellar outburst [J].

Cieza, Lucas A. ;

Casassus, Simon ;

Tobin, John ;

Bos, Steven P. ;

Williams, Jonathan P. ;

Perez, Sebastian ;

Zhu, Zhaohuan ;

Caceres, Claudio ;

Canovas, Hector ;

Dunham, Michael M. ;

Hales, Antonio ;

Prieto, Jose L. ;

Principe, David A. ;

Schreiber, Matthias R. ;

Ruiz-Rodriguez, Dary ;

Zurlo, Alice .

NATURE, 2016, 535 (7611) :258-+

[13] GASPS-A Herschel Survey of Gas and Dust in Protoplanetary Disks: Summary and Initial Statistics [J].

Dent, W. R. F. ;

Thi, W. F. ;

Kamp, I. ;

Williams, J. P. ;

Menard, F. ;

Andrews, S. ;

Ardila, D. ;

Aresu, G. ;

Augereau, J. -C. ;

Barrado y Navascues, D. ;

Brittain, S. ;

Carmona, A. ;

Ciardi, D. ;

Danchi, W. ;

Donaldson, J. ;

Duchene, G. ;

Eiroa, C. ;

Fedele, D. ;

Grady, C. ;

de Gregorio-Molsalvo, I. ;

Howard, C. ;

Huelamo, N. ;

Krivov, A. ;

Lebreton, J. ;

Liseau, R. ;

Martin-Zaidi, C. ;

Mathews, G. ;

Meeus, G. ;

Mendigutia, I. ;

Montesinos, B. ;

Morales-Calderon, M. ;

Mora, A. ;

Nomura, H. ;

Pantin, E. ;

Pascucci, I. ;

Phillips, N. ;

Pinte, C. ;

Podio, L. ;

Ramsay, S. K. ;

Riaz, B. ;

Riviere-Marichalar, P. ;

Roberge, A. ;

Sandell, G. ;

Solano, E. ;

Tilling, I. ;

Torrelles, J. M. ;

Vandenbusche, B. ;

Vicente, S. ;

White, G. J. ;

Woitke, P. .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2013, 125 (927) :477-505

[14]

DORSCHNER J, 1995, ASTRON ASTROPHYS, V300, P503

[15] Chemical evolution in ices on drifting, planet-forming pebbles [J].

Eistrup, Christian ;

Henning, Thomas .

ASTRONOMY & ASTROPHYSICS, 2022, 667

[16] A SPITZER IRS STUDY OF INFRARED VARIABILITY IN TRANSITIONAL AND PRE-TRANSITIONAL DISKS AROUND T TAURI STARS [J].

Espaillat, C. ;

Furlan, E. ;

D'Alessio, P. ;

Sargent, B. ;

Nagel, E. ;

Calvet, N. ;

Watson, Dan M. ;

Muzerolle, J. .

ASTROPHYSICAL JOURNAL, 2011, 728 (01)

[17] Steps toward interstellar silicate mineralogy -: VI.: Dependence of crystalline olivine IR spectra on iron content and particle shape [J].

Fabian, D ;

Henning, T ;

Jäger, C ;

Mutschke, H ;

Dorschner, J ;

Wehrhan, O .

ASTRONOMY & ASTROPHYSICS, 2001, 378 (01) :228-238

[18] DIGIT survey of far-infrared lines from protoplanetary disks I. [OI], [CII], OH, H2O, and CH+ [J].

Fedele, D. ;

Bruderer, S. ;

van Dishoeck, E. F. ;

Carr, J. ;

Herczeg, G. J. ;

Salyk, C. ;

Evans, N. J., II ;

Bouwman, J. ;

Meeus, G. ;

Henning, Th. ;

Green, J. ;

Najita, J. R. ;

Guedel, M. .

ASTRONOMY & ASTROPHYSICS, 2013, 559

[19]

Fischer W. J., 2022, ARXIV

[20] THE HIGHLY DYNAMIC BEHAVIOR OF THE INNERMOST DUST AND GAS IN THE TRANSITION DISK VARIABLE LRLL 31 [J].

Flaherty, K. M. ;

Muzerolle, J. ;

Rieke, G. ;

Gutermuth, R. ;

Balog, Z. ;

Herbst, W. ;

Megeath, S. T. ;

Kun, M. .

ASTROPHYSICAL JOURNAL, 2011, 732 (02)

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