B335 Archives - Astrobiology

Moment 0 map of the CH3OH 23(4,20)−22(5,18), E vt=0 line in four epochs. Each moment 0 map uses only emission above 3σ (1σ = 8.6 mJy beam−1 in Epoch 1 was adopted). The red circles in the moment map have the same diameter of 0.8′′. The synthesized beam for each data set is located in a gray oval in the lower left corner. -- astro-ph.SR

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Imaging & Spectroscopy, Status Report

A Natural Laboratory for Astrochemistry, a Variable Protostar B335

by Keith CowingOctober 10, 2024October 10, 2024

Emission lines from complex organic molecules in B335 were observed in four epochs, spanning a luminosity burst of about 10 years duration.

Moment 0 maps of the CH3OH (183,15−182,16, A, Eu=447 K), CH2DOH (42,2−41,3, e0, Eu/=38 K), CHD2OH (41,2−40,1, o1-e0, Eu=32 K), and CH3OD (51−40, E, Eu=49 K) emission. The integrated velocity range is from -0.2 km−1 to 14.5 km s−1 . The systemic velocity is 8.34 km s−1 (Yen et al. 2015). Contour levels are every 3σ from 3σ, where σ is 1.5 mJy beam−1 , 3.0 mJy beam−1 , 3.0 mJy beam−1 , and 2.0 mJy beam−1 , respectively. The spectra are obtained within each rectangle area (0. ′′03×0. ′′05) to calculate the temperature and the column density. The numbers represent the offsets from the continuum peak (0. ′′0). The white cross mark show the continuum peak position (α2000, δ2000) = (19h 37m00s .90, +7◦ 34′ 09.”49). The red ellipse in each map represents the beam size. The red and blue arrows in the panel (a) show the directions of the red- and blue-shifted outflow. -- astro-ph.GA

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Interstellar, Status Report

CH3OH and Its Deuterated Species in the Disk/Envelope System of the Low-Mass Protostellar Source B335

by Keith CowingMay 29, 2024May 29, 2024

Deuterium fractionation in the closest vicinity of a protostar is important in understanding its potential heritage to a planetary system.