Discovery of shocked H2 around OH 231.8+4.2

Forde, K. P.; Gledhill, Tim

doi:10.1111/j.1745-3933.2011.01204.x

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…The 2.122 µm 1−0 S(1) ro-vibrational emission line of H 2 is usually bright in warm, dense, molecular regions, and has been a commonly-used tracer of molecular gas in a variety of astrophysical environments, including PNe. This H 2 emission line has been detected in a number of Galactic PNe (e.g., Kastner et al 1994Kastner et al , 1996Latter et al 1995;Shupe et al 1995;Schild 1995;Guerrero et al 2000;Arias et al 2001;Ramos-Larios et al 2008Marquez-Lugo et al 2013 as well as proto-PNe (e.g., Hrivnak et al 2008;Forde & Gledhill 2012). Imaging studies of the H 2 images of PNe have revealed that the H 2 2.122 µm emission in PNe is generally associated with the bipolar morphology (e.g., Zuckerman & Gatley 1988;Webster et al 1988); this is known as the Gatley's rule, and the possible astrophysics as to this association is still discussed today (e.g., Ramos-Larios et al 2017).…”

Section: Introductionmentioning

confidence: 82%

“…This H 2 emission line has been detected in a number of Galactic PNe (e.g., Kastner et al 1994Kastner et al , 1996Latter et al 1995;Schild 1995;Shupe et al 1995;Guerrero et al 2000;Arias et al 2001;Ramos-Larios et al 2008Marquez-Lugo et al 2013 as well as proto-PNe (e.g., Hrivnak et al 2008;Forde & Gledhill 2012). Imaging studies of the H 2 images of PNe have revealed that the H 2 2.122 μm emission in PNe is generally associated with a bipolar morphology (e.g., Webster et al 1988;Zuckerman & Gatley 1988); this is known as Gatley's rule, and the possible astrophysics for this association is still discussed today (e.g.,…”

Section: Introductionmentioning

confidence: 85%

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Extended Structures of Planetary Nebulae Detected in H₂ Emission^∗

Fang

Zhang

Kwok

et al. 2018

ApJ

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We present narrowband near-infrared images of a sample of 11 Galactic planetary nebulae (PNe) obtained in the H 2 2.122 μm and Brγ 2.166 μm emission lines and the K c 2.218 μm continuum. These images were collected with the Wide-field Infrared Camera on the 3.6 m Canada-France-Hawaii Telescope (CFHT); their unprecedented depth and wide field of view allow us to find extended nebular structures in H 2 emission in several PNe, some of these being the first detection. The nebular morphologies in H 2 emission are studied in analogy with the optical images, and indication of stellar wind interactions is discussed. In particular, the complete structure of the highly asymmetric halo in NGC 6772 is witnessed in H 2 , which strongly suggests interaction with the interstellar medium. Our sample confirms the general correlation between H 2 emission and the bipolarity of PNe. The knotty or filamentary fine structures of the H 2 gas are resolved in the inner regions of several ring-like PNe, also confirming the previous argument that H 2 emission mostly comes from knots or clumps embedded within fully ionized material at the equatorial regions. Moreover, the H 2 image of the butterfly-shaped Sh 1-89, after removal of field stars, clearly reveals a tilted ring structure at the waist. These high-quality CFHT images justify follow-up detailed morphokinematic studies that are desired in order to deduce the true physical structures of a few PNe in the sample.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 85%

Extended Structures of Planetary Nebulae Detected in H₂ Emission^∗

Fang

Zhang

Kwok

et al. 2018

ApJ

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“…This uncommon situation makes OH 231.8+4.2 of special interest, since it demonstrates that asymmetries can develop (and become very prominent) while the central star is still on the AGB. OH 231.8+4.2 has been extensively studied at many wavelengths by several authors e.g., [17][18][19][20][21][22][23][24] (and references therein). The light from the central source inside OH 231.8's core is highly obscured by dust along the line-of-sight and is only seen indirectly scattered by the dust in the lobe walls, indicating the presence of an A 0-type main-sequence companion to the mass-losing AGB star, of spectral type M8-10 III [21].…”

Section: A Quest For Rotating Disks In Post-agb Objectsmentioning

confidence: 99%

ALMA’s Acute View of pPNe: Through the Magnifying Glass... and What We Found There

et al. 2018

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We present recent Atacama Large Millimeter/submillimeter Array (ALMA)-based studies of circumstellar envelopes (CSEs) around Asymptotic Giant Branch (AGB) stars and pre-Planetary Nebulae (pPNe). In only a few years of operation, ALMA is revolutionising the field of AGB-to-PN research by providing unprecedentedly detailed information on the complex nebular architecture (at large but also on small scales down to a few ∼10 AU from the centre), dynamics and chemistry of the outflows/envelopes of low-to-intermediate mass stars in their late stages of the evolution. Here, we focus on continuum and molecular line mapping studies with high angular resolution and sensitivity of some objects that are key to understanding the complex PN-shaping process. In particular, we offer (i) a brief summary of ALMA observations of rotating disks in post-AGB objects and (ii) report on ALMA observations of OH 231.8+4.2 providing the most detailed and accurate description of the global nebular structure and kinematics of this iconic object to date.

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Deep into the Water Fountains

Pérez-Sánchez

Tafoya

López

et al. 2017

A&A

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Context. The formation of large-scale (hundreds to few thousands of AU) bipolar structures in the circumstellar envelopes (CSEs) of post-Asymptotic Giant Branch (post-AGB) stars is poorly understood. The shape of these structures, traced by emission from fast molecular outflows, suggests that the dynamics at the innermost regions of these CSEs does not depend only on the energy of the radiation field of the central star. Aims. Multi-frequency observations towards a group of post-AGB sources known as Water Fountain nebulae can help to constrain the nature of the mechanism responsible for the launching and collimation of the fast molecular outlflows traced by high-velocity features of H 2 O maser emission. Methods. Deep into the Water Fountains is an observational project based on the results of programs carried out with three telescope facilities: The Karl G. Jansky Very Large Array (JVLA), The Australia Telescope Compact Array (ATCA), and the Very Large Telescope (SINFONI-VLT). Results. Here we report the results of the observations towards the WF nebula IRAS 18043−2116: Detection of radio continuum emission in the frequency range 1.5 GHz -8.0 GHz; H 2 O maser spectral features and radio continuum emission detected at 22 GHz, and H 2 ro-vibrational emission lines detected at the near infrared. Conclusions. The high-velocity H 2 O maser spectral features, and the shock-excited H 2 emission detected could be produced in molecular layers which are swept up as a consequence of the propagation of a jet-driven wind. Using the derived H 2 column density, we estimated a molecular mass-loss rate of the order of 10 −9 M yr −1 . On the other hand, if the radio continuum flux detected is generated as a consequence of the propagation of a thermal radio jet, the mass-loss rate associated to the outflowing ionized material is of the order of 10 −5 M yr −1 . The presence of a rotating disk could be a plausible explanation for the mass-loss rates estimated.

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Discovery of shocked H2 around OH 231.8+4.2

Cited by 5 publications

References 20 publications

Extended Structures of Planetary Nebulae Detected in H₂ Emission^∗

Extended Structures of Planetary Nebulae Detected in H₂ Emission^∗

ALMA’s Acute View of pPNe: Through the Magnifying Glass... and What We Found There

Deep into the Water Fountains

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Discovery of shocked H2 around OH 231.8+4.2

Cited by 5 publications

References 20 publications

Extended Structures of Planetary Nebulae Detected in H2 Emission∗

Extended Structures of Planetary Nebulae Detected in H2 Emission∗

ALMA’s Acute View of pPNe: Through the Magnifying Glass... and What We Found There

Deep into the Water Fountains

Contact Info

Product

Resources

About

Extended Structures of Planetary Nebulae Detected in H₂ Emission^∗

Extended Structures of Planetary Nebulae Detected in H₂ Emission^∗