Radio interferometric imaging of RS Oph bipolar ejecta for the 2021 nova outburst
Artikel i vetenskaplig tidskrift, 2022

The recurrent nova and symbiotic binary RS Oph erupted again in August 2021 for its eighth known outburst. We observed RS Oph 34 days after the outburst at 5 GHz with the European VLBI Network (EVN). The radio image is elongated over the east-west direction for a total extension of about 90 mas (or about 240 AU at the Gaia DR3 distance d = 2.68-0.15+0.17 kpc), and shows a bright and compact central component coincident with the Gaia astrometric position, and two lobes east and west of it, expanding perpendicular to the orbital plane. By comparing with the evolution of emission-line profiles on optical spectra, we found the leading edge of the lobes to be expanding at ~7550 km s-1, and i = 54 as the orbital inclination of the binary. The 2021 radio structure is remarkably similar to that observed following the 2006 eruption. The obscuring role of the density enhancement on the orbital plane (DEOP) is discussed in connection to the time-dependent visibility of the receding lobe in the background to the DEOP, and the origin of the triple-peaked profiles is traced to the ring structure formed by the nova ejecta impacting the DEOP.

Stars: winds, outflows

Novae, cataclysmic variables

Författare

U. Munari

Istituto nazionale di astrofisica (INAF)

M. Giroletti

Istituto di Radioastronomia

B. Marcote

JOINT INSTITUTE FOR V.L.B.I. IN EUROPE (J.I.V.E.)

T. J. O'Brien

University of Manchester

P. Veres

Center for Space Plasma and Aeronomic Research

Jun Yang

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

D. R.A. Williams

University of Manchester

P. A. Woudt

University of Cape Town

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 666 L6

Ämneskategorier

Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Den kondenserade materiens fysik

DOI

10.1051/0004-6361/202244821

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Senast uppdaterat

2023-09-15