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Article Dans Une Revue The Astrophysical Journal Année : 2022

Ice Features of Low-luminosity Protostars in Near-infrared Spectra of AKARI/IRC

Jeong-Eun Lee
Il-Seok Kim
  • Fonction : Auteur
Yuri Aikawa
Michael M. Dunham
  • Fonction : Auteur
Chul-Hwan Kim
  • Fonction : Auteur
Bon-Chul Koo
Michael Dunham

Résumé

We present near-infrared spectra of three low-luminosity protostars and one background star in the Perseus molecular cloud, acquired using the infrared camera on board the AKARI space telescope. For the comparison with different star-forming environments, we also present spectra of the massive protostar AFGL 7009S, where the protostellar envelope is heated significantly, and the low-mass protostar RNO 91, which is suspected to be undergoing an episodic burst. We detected ice absorption features of H 2 O, CO 2 , and CO in all spectra around the wavelengths of 3.05, 4.27, and 4.67 μ m, respectively. For at least two low-luminosity protostars, we also detected the XCN ice feature at 4.62 μ m. The presence of the crystalline H 2 O ice and XCN ice components indicates that the low-luminosity protostars experienced a hot phase via accretion bursts during the past mass accretion process. We compared the ice abundances of the low-luminosity protostars with those of embedded low-mass protostars and the dense molecular clouds and cores, suggesting that their ice abundances reflect the strength of prior bursts and the timescale after the last burst.
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Dates et versions

hal-03799354 , version 1 (29-10-2023)

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Jaeyeong Kim, Jeong-Eun Lee, Woong-Seob Jeong, Il-Seok Kim, Yuri Aikawa, et al.. Ice Features of Low-luminosity Protostars in Near-infrared Spectra of AKARI/IRC. The Astrophysical Journal, 2022, 935 (2), pp.137. ⟨10.3847/1538-4357/ac7f9f⟩. ⟨hal-03799354⟩

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