2007/12/14 by Jeong-Eun Lee
Physics and Astronomy · #Accretion (finance) #Accretion disc #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Chemical evolution #Electrical and Electromagnetic Research #Luminosity #Space (punctuation) #Thermal #astro-ph
paper · pdf · doi:10.5303/jkas.2007.40.4.083
corrected e-mail address
arxiv created 2007/12/14 · openalex publication_date 2007/12/31 · openalex created_date 2016/06/24 · arxiv updated 2017/01/18 · openalex updated_date 2026/08/05
A new type of object called "Very Low Luminosity Objects (VeLLOs)" has been discovered by the Spitzer Space Telescope. VeLLOs might be substellar objects forming by accretion. However, some VeLLOs are associated with strong outflows, indicating the previous existence of massive accretion. The thermal history, which significantly affects the chemistry, between substellar objects with a continuous low accretion rate and objects in a quiescent phase after massive accretion (outburst) must be greatly different. In this study, the chemical evolution has been calculated in an episodic accretion model to show that CO and <TEX>N2H+</TEX> have a relation different from starless cores or Class 0/I objects. Furthermore, the <TEX>CO2</TEX> ice feature at <TEX>15.2μm</TEX> will be a good tracer of the thermal process in VeLLOs.