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arXiv · 2412.12813

Confirmation of the planetary nebula nature of HaTr 5. Not the remnant of Nova Sco 1437

M. A. Guerrero·E. Santamaria·G. Liberato·Q. A. Parker·D. R. Goncalves·J. B. Rodriguez-Gonzalez·A. Ritter·H. Yuan·J. A. Toala
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Abstract

The identification of the nebula HaTr 5 with the shell remnant of the historic Nova Sco 1437 around the low-accretion rate cataclysmic variable 2MASS J17022815-4306123 has been used in the framework of the hibernation scenario to set an upper limit of <580 yr to the transition time from a nova-like binary to a dwarf nova. This work aims at clarifying the nature of HaTr 5, which has also previously been proposed to be a possible planetary nebula. Intermediate- and high-dispersion long-slit spectra of HaTr\,5 have been obtained and analyzed in conjunction with archival optical and infrared images to investigate its spectral properties using photoionization models, to derive its H-alpha flux and ionized mass, and to determine its spatio-kinematic by means of 3D models to clarify its true nature. The H-alpha flux of HaTr 5 implies an ionized mass of 0.059 M_Sun at the 0.99 kpc distance of J170228, i.e., about 1000 times the typical ejecta of a nova. If HaTr\,5 were actually an unrelated planetary nebula, its H-alpha flux implies a distance of 2.25 kpc and an ionized mass of 0.47 M_Sun. The expansion velocity of HaTr 5 is found to be of 27 km/s, with a heliocentric radial velocity of -1 km/. The ionized mass of HaTr 5 and its expansion velocity (and associated kinematic age) are clearly inconsistent with those expected for a nova remnant, which all strongly support a planetary nebula nature. The association of J170228 with HaTr 5 is further called into question by their differing radial velocities and almost orthogonal motions on the plane of the sky. It is concluded that HaTr 5 is an old, evolved planetary nebula unrelated to the remnant of Nova Sco 1437 and to the cataclysmic variable J170228, the latter being by chance projected onto HaTr 5.

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M. A. Guerrero, E. Santamaria, G. Liberato, Q. A. Parker, D. R. Goncalves, J. B. Rodriguez-Gonzalez, A. Ritter, H. Yuan, J. A. Toala. 2024-12-17. Confirmation of the planetary nebula nature of HaTr 5. Not the remnant of Nova Sco 1437. https://doi.org/10.1051/0004-6361%2F202452816

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