Planck Cold Clumps in the λ Orionis Complex. I. Discovery of an Extremely Young Class 0 Protostellar Object and a Proto-brown Dwarf Candidate in the Bright-rimmed Clump PGCC G192.32-11.88 - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Supplement Series Year : 2016

Planck Cold Clumps in the λ Orionis Complex. I. Discovery of an Extremely Young Class 0 Protostellar Object and a Proto-brown Dwarf Candidate in the Bright-rimmed Clump PGCC G192.32-11.88

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Tie Liu
  • Function : Author
Qizhou Zhang
Kee-Tae Kim
Yuefang Wu
  • Function : Author
Chang Won Lee
  • Function : Author
Jeong-Eun Lee
  • Function : Author
Ken'Ichi Tatematsu
  • Function : Author
Minho Choi
  • Function : Author
Mika Juvela
  • Function : Author
Mark Thompson
  • Function : Author
Paul F. Goldsmith
  • Function : Author
Sheng-Yuan Liu
  • Function : Author
Hirano Naomi
  • Function : Author
Patrick Koch
Christian Henkel
  • Function : Author
Patricio Sanhueza
Jinhua He
  • Function : Author
Alana Rivera-Ingraham
  • Function : Author
Ke Wang
Maria R. Cunningham
  • Function : Author
Ya-Wen Tang
  • Function : Author
Shih-Ping Lai
  • Function : Author
Jinghua Yuan
  • Function : Author
Di Li
  • Function : Author
Gary Fuller
  • Function : Author
Miju Kang
  • Function : Author
Quang Nguyen Luong
  • Function : Author
Hauyu Baobab Liu
  • Function : Author
Ji Yang
  • Function : Author
Ye Xu
  • Function : Author
Tomoya Hirota
Diego Mardones
  • Function : Author
Sheng-Li Qin
  • Function : Author
Huei-Ru Chen
  • Function : Author
Woojin Kwon
  • Function : Author
Fanyi Meng
  • Function : Author
Huawei Zhang
  • Function : Author
Mi-Ryang Kim
  • Function : Author
Hee-Weon Yi
  • Function : Author

Abstract

We are performing a series of observations with ground-based telescopes toward Planck Galactic cold clumps (PGCCs) in the λ Orionis complex in order to systematically investigate the effects of stellar feedback. In the particular case of PGCC G192.32-11.88, we discovered an extremely young Class 0 protostellar object (G192N) and a proto-brown dwarf candidate (G192S). G192N and G192S are located in a gravitationally bound bright-rimmed clump. The velocity and temperature gradients seen in line emission of CO isotopologues indicate that PGCC G192.32-11.88 is externally heated and compressed. G192N probably has the lowest bolometric luminosity (∼0.8 {L}) and accretion rate (6.3 × 10-7 {M} yr-1) when compared with other young Class 0 sources (e.g., PACS Bright Red Sources) in the Orion complex. It has slightly larger internal luminosity (0.21 ± 0.01 {L}) and outflow velocity (∼14 km s-1) than the predictions of first hydrostatic cores (FHSCs). G192N might be among the youngest Class 0 sources, which are slightly more evolved than an FHSC. Considering its low internal luminosity (0.08 ± 0.01 {L}) and accretion rate (2.8 × 10-8 {M} yr-1), G192S is an ideal proto-brown dwarf candidate. The star formation efficiency (∼0.3%-0.4%) and core formation efficiency (∼1%) in PGCC G192.32-11.88 are significantly smaller than in other giant molecular clouds or filaments, indicating that the star formation therein is greatly suppressed owing to stellar feedback.

Dates and versions

insu-03670558 , version 1 (17-05-2022)

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Tie Liu, Qizhou Zhang, Kee-Tae Kim, Yuefang Wu, Chang Won Lee, et al.. Planck Cold Clumps in the λ Orionis Complex. I. Discovery of an Extremely Young Class 0 Protostellar Object and a Proto-brown Dwarf Candidate in the Bright-rimmed Clump PGCC G192.32-11.88. The Astrophysical Journal Supplement Series, 2016, 222, ⟨10.3847/0067-0049/222/1/7⟩. ⟨insu-03670558⟩
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