The JWST Early-release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 μm Spectrum of the Planetary-mass Companion VHS 1256-1257 b

被引：101

作者：

Miles, Brittany E. ^{[1
,2
]}

Biller, Beth A. ^{[3
,4
]}

Patapis, Polychronis ^{[5
]}

Worthen., Kadin ^{[6
]}

Rickman., Emily ^{[7
,8
]}

Hoch, Kielan K. W. ^{[9
]}

Skemer, Andrew. ^{[1
]}

Perrin, Marshall D. ^{[8
]}

Whiteford, Niall ^{[10
]}

Chen, Christine H. ^{[6
,11
]}

Sargent, B. ^{[9
]}

Mukherjee, Sagnick ^{[1
]}

Morley, Caroline V. ^{[12
]}

Moran, Sarah E. ^{[13
]}

Bonnefoy, Mickael ^{[14
]}

Petrus, Simon ^{[15
,16
]}

Carter, Aarynn L. ^{[1
]}

Choquet, Elodie ^{[17
]}

Hinkley, Sasha ^{[18
]}

Ward-Duong, Kimberly ^{[19
]}

Leisenring, Jarron M. ^{[20
]}

Millar-Blanchaer, Maxwell A. ^{[21
]}

Pueyo, Laurent ^{[8
]}

Ray, Shrishmoy ^{[18
]}

Sallum, Steph ^{[22
]}

Stapelfeldt, Karl R. ^{[23
]}

Stone, Jordan M. ^{[24
]}

Wang, Jason J. ^{[25
,26
,27
]}

Absil, Olivier ^{[28
]}

Balmer, William O. ^{[6
,8
]}

Boccaletti, Anthony ^{[29
]}

Bonavita, Mariangela ^{[30
]}

Booth, Mark ^{[31
,32
]}

Bowler, Brendan P. ^{[12
]}

Chauvin, Gael ^{[33
]}

Christiaens, Valentin ^{[34
]}

Currie, Thayne ^{[35
,36
]}

Danielski, Camilla ^{[37
]}

Fortney, Jonathan J. ^{[1
]}

Girard, Julien H. ^{[8
]}

Grady, Carol A. ^{[38
]}

Greenbaum, Alexandra Z. ^{[39
]}

Henning, Thomas ^{[40
]}

Hines, Dean C. ^{[8
]}

Janson, Markus ^{[41
]}

Kalas, Paul ^{[42
,43
,44
]}

Kammerer, Jens ^{[8
]}

Kennedy, Grant M. ^{[45
]}

Kenworthy, Matthew A. ^{[46
]}

Kervella, Pierre ^{[29
]}

机构：

[1] Univ Calif Santa Cruz, Dept Astron & Astrophys, 1156 High St, Santa Cruz, CA 95064 USA

[2] Univ Calif Irvine, Dept Phys & Astron, 4129 Frederick Reines Hall, Irvine, CA 92697 USA

[3] Univ Edinburgh, Scottish Univ Phys Alliance, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[4] Univ Edinburgh, Ctr Exoplanet Sci, Edinburgh EH9 3HJ, Midlothian, Scotland

[5] Swiss Fed Inst Technol, Inst Particle Phys & Astrophys, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

[6] Johns Hopkins Univ, Dept Phys & Astron, 3400 N Charles S, Baltimore, MD 21218 USA

[7] ESA, ESA Off, Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[8] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[9] Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA

[10] Amer Museum Nat Hist, Dept Astrophys, Cent Pk West,79th St, New York, NY 10024 USA

[11] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[12] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[13] Univ Arizona, Lunar & Planetary Lab, Dept Planetary Sci, Tucson, AZ 85721 USA

[14] Univ Grenoble Alpes, Inst Planetol & Astrophys IPAG, F-38000 Grenoble, France

[15] Univ Valparaiso, Fac Ciencias, Inst Fis & Astron, Ave Gran Bretana 1111,Ave Gran Bretana 1111, Valparaiso, Chile

[16] Univ Valparaiso, Nucleo Milenio Formac Planetaria NPF, Ave Gran Bretana 1111, Valparaiso, Chile

[17] Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France

[18] Univ Exeter, Astrophys Grp, Phys Bldg,Stocker Rd, Exeter EX4 4QL, Devon, England

[19] Smith Coll, Dept Astron, Northampton, MA 01063 USA

[20] Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA

[21] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[22] Univ Calif Irvine, Dept Phys & Astron, 4129 Frederick Reines Hall, Irvine, CA 92697 USA

[23] CALTECH, Jet Prop Lab, Mail Stop 321-100,4800 Oak Grove Dr, Pasadena, CA 91109 USA

[24] Naval Res Lab, Remote Sensing Div, 4555 Overlook Ave SW, Washington, DC 20375 USA

[25] Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys CI, Evanston, IL 60208 USA

[26] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

[27] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[28] Univ Liege, STAR Inst, Allee 6 Aout 19c, B-4000 Liege, Belgium

[29] Sorbonne Univ, Univ Paris Cite, CNRS, LESIA,Observ Paris,Univ PSL, 5 Pl Jules Janssen, F-92195 Meudon, France

[30] Open Univ, Fac Sci Technol Engn & Math, Sch Phys Sci, Walton Hall, Milton Keynes MK7 6AA, Bucks, England

[31] Friedrich Schiller Univ Jena, Astrophys Inst, Schillergasschen 2-3, D-07745 Jena, Germany

[32] Friedrich Schiller Univ Jena, Univ Sternwarte, Schillergasschen 2-3, D-07745 Jena, Germany

[33] Univ Cote OAzur, Lab JL Lagrange, CNRS, Observ Cote OAzur, F-06304 Nice, France

[34] Univ Liege, STAR Inst, Allee 6 Aout 19c, B-4000 Liege, Belgium

[35] Univ Texas San Antonio, Dept Phys & Astron, 1 UTSA Circle, San Antonio, TX USA

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

[37] CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain

[38] Eureka Sci, 2452 Delmer St,Suite 1, Oakland, CA 96402 USA

[39] CALTECH, IPAC, 1200 E Calif Blvd, Pasadena, CA 91125 USA

[40] MPI Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

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

[42] Univ Calif Berkeley, Dept Astron, 501 Campbell Hall, Berkeley, CA 94720 USA

[43] SETI Inst, Carl Sagan Ctr, 189 Bernardo Ave, Mountain View, CA 94043 USA

[44] FORTH, Inst Astrophys, GR-71110 Iraklion, Greece

[45] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

[46] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[47] Univ Paris Saclay, Univ Paris Cite, CEA, CNRS,AIM, F-91191 Gif Sur Yvette, France

[48] Bay Area Environm Res Inst, Moffett Field, CA 94035 USA

[49] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[50] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2023年 / 946卷 / 01期

基金：

欧洲研究理事会; 英国科学技术设施理事会;

关键词：

WEBB-SPACE-TELESCOPE; SPITZER INFRARED SPECTROGRAPH; BROWN DWARF; EMISSION-SPECTRUM; GIANT PLANETS; T-DWARFS; MIDINFRARED INSTRUMENT; CHEMICAL-EQUILIBRIUM; EVOLUTIONARY MODELS; CONDENSATION CLOUDS;

D O I：

10.3847/2041-8213/acb04a

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the highest fidelity spectrum to date of a planetary-mass object. VHS 1256 b is a M (Jup) widely separated (similar to 8 '', a = 150 au), young, planetary-mass companion that shares photometric colors and spectroscopic features with the directly imaged exoplanets HR 8799c, d, and e. As an L-to-T transition object, VHS 1256 b exists along the region of the color-magnitude diagram where substellar atmospheres transition from cloudy to clear. We observed VHS 1256 b with JWST's NIRSpec IFU and MIRI MRS modes for coverage from 1 to 20 mu m at resolutions of similar to 1000-3700. Water, methane, carbon monoxide, carbon dioxide, sodium, and potassium are observed in several portions of the JWST spectrum based on comparisons from template brown dwarf spectra, molecular opacities, and atmospheric models. The spectral shape of VHS 1256 b is influenced by disequilibrium chemistry and clouds. We directly detect silicate clouds, the first such detection reported for a planetary-mass companion.

引用

页数：19

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