Deuterium-enriched water ties planet-forming disks to comets and protostars

Abstract

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The Principal Component Analysis Filtering Method for an Unbiased Spectral Survey of Complex Organic Molecules

“…Loomis et al (2018) and van 't Hoff et al (2020) also showed a similar emission distribution for protoplanetary disks. The high-resolution images show a crescent shape of emission distribution with a central emission hole within r∼0 1 (Lee et al 2019b;Tobin et al 2023), but the elongated beam shape of SG3 distorts the emission distribution in the images used in this study. In addition, the central emission hole, which is produced by the optically thick dust emission, is also distorted by the elongated beam shape, resulting in the dip between two elongated…”

“…Various simple molecules and COMs have been detected, and it has been demonstrated that different molecules trace different kinematic components within V883 Ori. Among the detected lines, as presented in Tobin et al (2023), the HDO line is detected toward the inner region of the protoplanetary disk within the projected radius of ∼120 au (0 3), and the COMs' emission is confined within the water sublimation region. To identify all the detected COM lines and derive the physical conditions of the gas component associated with COM emission, high-S/N line spectra corrected for the kinematics are essential.…”

“…Recently, interstellar COMs have been discovered in various physical and dynamic conditions (Ceccarelli et al 2022). Particularly, COMs are found in the inner regions of protostellar envelopes and protoplanetary disks, where the icy mantle on dust sublimates above a temperature of ∼100 K (Lee et al 2019b;Bianchi et al 2022;Tobin et al 2023). Detection of various COMs near protostars raises intriguing questions about how and when these COMs would be delivered to forming planets.…”

“…Tobin et al (2023) detected water (HDO and H 2 18 O) lines and estimated the water snowline, which is the water sublimation radius in the disk midplane, at ∼80 au in V883 Ori. Because of the temperature structure, the water sublimation front develops the two-dimensional surface in the disk and extends to ∼0 3 in the disk surface of V883 Ori (Lee et al 2019b;Tobin et al 2023). In this paper, the water sublimation radius refers to the water sublimation radius in the disk surface.…”

Spiers Memorial Lecture: Astrochemistry at high resolution

“…In the region where the temperature exceeds that of water ice sublimation (∼120 K, which correspond to a radius of about 320 au in the case of V388), iCOMs trapped in the ice are injected into the gas-phase, like in the hot corinos (Section 3.2), and become observable along with water. 97–101 Not surprisingly, the detection of methanol, acetaldehyde, methyl formate and methyl cyanide have been reported. 98,99…”