The Formation Conditions of the Wide Binary Class 0 Protostars within BHR 71
Tobin, John J.1,2,14; Bourke, Tyler L.3; Mader, Stacy4; Kristensen, Lars5,6; Arce, Hector7; Gueth, Frederic8; Gusdorf, Antoine9; Codella, Claudio10,11; Leurini, Silvia12; Chen, Xuepeng13
Corresponding AuthorTobin, John J.(
AbstractWe present a characterization of the binary protostar system that is forming within a dense core in the isolated dark cloud BHR71. The pair of protostars, IRS1 and IRS2, are both in the Class 0 phase, determined from observations that resolve the sources from 1 mu m out to 250 mu m and from 1.3. mm to 1.3. cm. The resolved observations enable the luminosities of IRS1 and IRS2 to be independently measured (14.7 and 1.7 L-circle dot, respectively), in addition to the bolometric temperatures 68 K and 38 K, respectively. The surrounding core was mapped in NH3 (1, 1) with the Parkes radio telescope, and followed with higher-resolution observations from ATCA in NH3 (1, 1) and 1.3. cm continuum. The protostars were then further characterized with ALMA observations in the 1.3. mm continuum along with N2D+ (J = 3 -> 2), (CO)-C-12, (CO)-C-13, and (CO)-O-18 (J = 2 -> 1) molecular lines. The Parkes observations find evidence for a velocity gradient across the core surrounding the two protostars, while ATCA reveals more complex velocity structure toward the protostars within the large-scale gradient. The ALMA observations then reveal that the two protostars are at the same velocity in (CO)-O-18, and N2D+ exhibits a similar velocity structure as NH3. However, the (CO)-O-18 kinematics reveal that the rotation on scales < 1000. au around IRS1 and IRS2 are in opposite directions. Taken with the lack of a systematic velocity difference between the pair, it is unlikely that their formation resulted from rotational fragmentation. We instead conclude that the binary system most likely formed via turbulent fragmentation of the core.
KeywordISM: individual objects (BHR71) ISM: kinematics and dynamics ISM: molecules stars: formation stars: protostars techniques: interferometric
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000455820100027
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Document Type期刊论文
Corresponding AuthorTobin, John J.
Affiliation1.Univ Oklahoma, Homer L Dodge Dept Phys & Astron, 440 W Brooks St, Norman, OK 73019 USA
2.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
3.Jodrell Bank Observ, SKA Org, Macclesfield SK11 9DL, Cheshire, England
4.Parkes Observ, CSIRO Astron & Space Sci, POB 276, Parkes, NSW 2870, Australia
5.Univ Copenhagen, Ctr Star & Planet Format, Niels Bohr Inst, Oster Voldgade 5-7, DK-1350 Copenhagen K, Denmark
6.Univ Copenhagen, Nat Hist Museum Denmark, Oster Voldgade 5-7, DK-1350 Copenhagen K, Denmark
7.Yale Univ, Dept Astron, POB 208101, New Haven, CT 06520 USA
8.Inst Radioastron Millimetr IRAM, F-38406 St Martin Dheres, France
9.UPMC Univ Paris 06, Sorbonne Univ, Observ Paris, CNRS,LERMA,Ecole Normale Super,PSL Res Univ, F-75231 Paris, France
10.Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy
11.Univ Grenoble Alpes, Inst Planetol & Astrophys Grenoble, F-38401 Grenoble, France
12.INAF Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy
13.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China
14.Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA
Recommended Citation
GB/T 7714
Tobin, John J.,Bourke, Tyler L.,Mader, Stacy,et al. The Formation Conditions of the Wide Binary Class 0 Protostars within BHR 71[J]. ASTROPHYSICAL JOURNAL,2019,870(2):30.
APA Tobin, John J..,Bourke, Tyler L..,Mader, Stacy.,Kristensen, Lars.,Arce, Hector.,...&Chen, Xuepeng.(2019).The Formation Conditions of the Wide Binary Class 0 Protostars within BHR 71.ASTROPHYSICAL JOURNAL,870(2),30.
MLA Tobin, John J.,et al."The Formation Conditions of the Wide Binary Class 0 Protostars within BHR 71".ASTROPHYSICAL JOURNAL 870.2(2019):30.
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