Tomography of the Unique Ongoing Jet in the Planetary Nebula NGC 2392
Por:
Guerrero, M. A., Cazzoli, S., Rechy-Garcia, J. S., Ramos-Larios, G., Montoro-Molina, B., Gomez-Gonzalez, V. M. A., Toala, J. A., Fang, X.
Publicada:
1 mar 2021
Resumen:
Jets (fast collimated outflows) are claimed to be the main shaping agent
of the most asymmetric planetary nebulae (PNs), as they impinge on the
circumstellar material at late stages of the asymptotic giant branch
phase. The first jet detected in a PN was that of NGC 2392, yet there is
no available image because of its low surface brightness contrast with
the bright nebular emission. Here we take advantage of the tomographic
capabilities of Gran Telescopio de Canarias Multi-Espectrografo en GTC
de Alta Resolucion para Astronomia high-dispersion integral field
spectroscopic observations of the jet in NGC 2392 to gain unprecedented
details of its morphology and kinematics. The jet of NGC 2392 is found
to emanate from the central star, break through the walls of the inner
shell of this iconic PN and extend outside the nebula's outermost
regions with an S-shaped morphology suggestive of precession. At odds
with the fossil jets found in mature PNs, the jet in NGC 2392 is
currently being collimated and launched. The high nebular excitation of
NGC 2392, which implies an He++/He ionization fraction too high to be
attributed to the known effective temperature of the star, has been
proposed in the past to hint at the presence of a hot white dwarf
companion. In conjunction with the hard X-ray emission from the central
star, the present-day jet collimation would support the presence of such
a double-degenerate system where one component undergoes accretion from
a remnant circumbinary disk of the common envelope phase.
Filiaciones:
Guerrero, M. A.:
Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain
Cazzoli, S.:
Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain
Rechy-Garcia, J. S.:
UNAM, Inst Radioastron & Astrofis, Campus Morelia,Apartado Postal 3-72, Morelia 58090, Michoacan, Mexico
Ramos-Larios, G.:
Univ Guadalajara, CUCEI, Inst Astron & Meteorol, Av Vallarta 2602, Guadalajara 44130, Jalisco, Mexico
Montoro-Molina, B.:
Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain
Gomez-Gonzalez, V. M. A.:
UNAM, Inst Radioastron & Astrofis, Campus Morelia,Apartado Postal 3-72, Morelia 58090, Michoacan, Mexico
Toala, J. A.:
UNAM, Inst Radioastron & Astrofis, Campus Morelia,Apartado Postal 3-72, Morelia 58090, Michoacan, Mexico
Fang, X.:
Chinese Acad Sci NAOC, Natl Astron Observ, Key Lab Opt Astron, Beijing, Peoples R China
Univ Hong Kong, Fac Sci, Dept Phys, Hong Kong, Peoples R China
Univ Hong Kong, Fac Sci, Lab Space Res, Hong Kong, Peoples R China
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