2025RNAAS...9..278L

Query : 2025RNAAS...9..278L

2025RNAAS...9..278L - Research Notes of the AAS, 9, 278 (2025/October-0)

Refining the Migrating Differentiated Planetesimal Disruption Model for Classical T-Tauri Star RW Aur A's Dimming Events.

LISSE C.M., SITKO M.L., WOLK S.J., GUNTHER H.M., BRITTAIN S., BECK T., CHEN C., SARGENT B., GREEN J.D., STECKLOFF J., JOHNSON B.C., ESPAILLAT C.C., KOUTOULAKI M., JACKSON A.P., MITTAL T. and SILVERBERG S.

Abstract (from CDS):

C. M. Lisse et al. (2022) published a near-infrared time domain spectral study of the dimming events in RW Aurigae A (RWAurA). Emission from the protostellar surface, protostellar atmosphere, accretion disk, and jets was reported, with the most pronounced changes seen in jet emission amplitude due to siderophilic elements. RWAurA also evinced a strong increase in protostellar atmosphere emission due to accretion by lithophilic elements. This segregation of emission features was noted to match the evaporation susceptibility of a differentiated planetesimal's core versus the thermal stability of rocky mantle solids in the environment of the inner accretion disk wall region, and a fortuitous planetesimal collisional disruption was hypothesized. Here we refine this event as the consequence of the tidal disruption of an inwardly migrating differentiated planetesimal containing a molten core, and call for re-monitoring of the system in the light of H I:Fe II:Ni II:S II:N I:He I during the new major dimming event that started in early 2025.

Journal keyword(s): Infrared spectroscopy - T Tauri stars - Planetary cores - Light curves - Time domain astronomy - Stellar accretion disks - Stellar jets - Planetesimals - Planetary migration - Mantle

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	V* RW Aur A	Or*	05 07 49.4562212112	+30 24 04.774882068						K6	42	0

Query : 2025RNAAS...9..278L

Basic data :

V* RW Aur A -- Orion Variable

** (**,CCDM,...), * (2019AJ,Gaia), Or* (2023A&A), V* (V*)

05 07 49.4562212112 +30 24 04.774882068 (Optical) [ 0.0365 0.0252 90 ] A 2020yCat.1350....0G

05 04 37.6307079699 +30 20 13.161370118 [ 0.0365 0.0252 90 ]

174.2040540389650 -06.0032587311942 [ 0.0365 0.0252 90 ]

2.641 -27.398 [0.049 0.036 90] A 2020yCat.1350....0G

6.4062 [0.0441] A 2020yCat.1350....0G

K6 D 2021ApJS..254...20L

G 12.184072 [0.008555] C 2020yCat.1350....0G

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` JOY 5A`**	*`V RW Aur A`**	`Gaia DR3 156430822114424576`
`CCDM J05078+3024A`	`WDS J05078+3024A`	`Gaia DR2 156430822114424576`

References (42 between 1850 and 2026) (Total 42)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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CCDM J05078+3024A V* RW Aur A WDS J05078+3024A Gaia DR3 156430822114424576 Gaia DR2 156430822114424576

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