Herschel Planetary Nebula Survey (HerPlaNS): First detection of OH + in planetary nebulae

I. Aleman; T. Ueta; D. Ladjal; K. M. Exter; J. H. Kastner; R. Montez; A. G.G.M. Tielens; Y. H. Chu; H. Izumiura; I. McDonald; R. Sahai; N. Siódmiak; R. Szczerba; P. A.M. Van Hoof; E. Villaver; W. Vlemmings; M. Wittkowski; A. A. Zijlstra

doi:10.1051/0004-6361/201322940

Herschel Planetary Nebula Survey (HerPlaNS): First detection of OH ⁺ in planetary nebulae

I. Aleman, T. Ueta, D. Ladjal, K. M. Exter, J. H. Kastner, R. Montez, A. G.G.M. Tielens, Y. H. Chu, H. Izumiura, I. McDonald, R. Sahai, N. Siódmiak, R. Szczerba, P. A.M. Van Hoof, E. Villaver, W. Vlemmings, M. Wittkowski, A. A. Zijlstra

Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Aims. We report the first detections of OH⁺ emission in planetary nebulae (PNe). Methods. As part of an imaging and spectroscopy survey of 11 PNe in the far-IR using the PACS and SPIRE instruments aboard the Herschel Space Observatory, we performed a line survey in these PNe over the entire spectral range between 51μm and 672μm to look for new detections. Results. The rotational emission lines of OH⁺ at 152.99, 290.20, 308.48, and 329.77μm were detected in the spectra of three planetary nebulae: NGC 6445, NGC 6720, and NGC 6781. Excitation temperatures and column densities derived from these lines are in the range of 27-47 K and 2 × 10¹⁰-4 × 10¹¹ cm^-2, respectively. Conclusions. In PNe, the OH⁺ rotational line emission appears to be produced in the photodissociation region (PDR) in these objects. The emission of OH⁺ is observed only in PNe with hot central stars (T_eff> 100 000 K), suggesting that high-energy photons may play a role in OH⁺ formation and its line excitation in these objects, as seems to be the case for ultraluminous galaxies.

Original language	English (US)
Article number	A79
Journal	Astronomy and Astrophysics
Volume	566
DOIs	https://doi.org/10.1051/0004-6361/201322940
State	Published - Jun 2014

Keywords

Astrochemistry
Circumstellar matter
Planetary nebulae: general
Planetary nebulae: individual: NGC 6445
Planetary nebulae: individual: NGC 6720
Planetary nebulae: individual: NGC 6781

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1051/0004-6361/201322940

Cite this

Aleman, I., Ueta, T., Ladjal, D., Exter, K. M., Kastner, J. H., Montez, R., Tielens, A. G. G. M., Chu, Y. H., Izumiura, H., McDonald, I., Sahai, R., Siódmiak, N., Szczerba, R., Van Hoof, P. A. M., Villaver, E., Vlemmings, W., Wittkowski, M., & Zijlstra, A. A. (2014). Herschel Planetary Nebula Survey (HerPlaNS): First detection of OH ⁺ in planetary nebulae. Astronomy and Astrophysics, 566, [A79]. https://doi.org/10.1051/0004-6361/201322940

Herschel Planetary Nebula Survey (HerPlaNS) : First detection of OH ⁺ in planetary nebulae. / Aleman, I.; Ueta, T.; Ladjal, D.; Exter, K. M.; Kastner, J. H.; Montez, R.; Tielens, A. G.G.M.; Chu, Y. H.; Izumiura, H.; McDonald, I.; Sahai, R.; Siódmiak, N.; Szczerba, R.; Van Hoof, P. A.M.; Villaver, E.; Vlemmings, W.; Wittkowski, M.; Zijlstra, A. A.

In: Astronomy and Astrophysics, Vol. 566, A79, 06.2014.

Research output: Contribution to journal › Article › peer-review

Aleman, I, Ueta, T, Ladjal, D, Exter, KM, Kastner, JH, Montez, R, Tielens, AGGM, Chu, YH, Izumiura, H, McDonald, I, Sahai, R, Siódmiak, N, Szczerba, R, Van Hoof, PAM, Villaver, E, Vlemmings, W, Wittkowski, M & Zijlstra, AA 2014, 'Herschel Planetary Nebula Survey (HerPlaNS): First detection of OH ⁺ in planetary nebulae', Astronomy and Astrophysics, vol. 566, A79. https://doi.org/10.1051/0004-6361/201322940

Aleman, I. ; Ueta, T. ; Ladjal, D. ; Exter, K. M. ; Kastner, J. H. ; Montez, R. ; Tielens, A. G.G.M. ; Chu, Y. H. ; Izumiura, H. ; McDonald, I. ; Sahai, R. ; Siódmiak, N. ; Szczerba, R. ; Van Hoof, P. A.M. ; Villaver, E. ; Vlemmings, W. ; Wittkowski, M. ; Zijlstra, A. A. / Herschel Planetary Nebula Survey (HerPlaNS) : First detection of OH ⁺ in planetary nebulae. In: Astronomy and Astrophysics. 2014 ; Vol. 566.

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title = "Herschel Planetary Nebula Survey (HerPlaNS): First detection of OH + in planetary nebulae",

abstract = "Aims. We report the first detections of OH+ emission in planetary nebulae (PNe). Methods. As part of an imaging and spectroscopy survey of 11 PNe in the far-IR using the PACS and SPIRE instruments aboard the Herschel Space Observatory, we performed a line survey in these PNe over the entire spectral range between 51μm and 672μm to look for new detections. Results. The rotational emission lines of OH+ at 152.99, 290.20, 308.48, and 329.77μm were detected in the spectra of three planetary nebulae: NGC 6445, NGC 6720, and NGC 6781. Excitation temperatures and column densities derived from these lines are in the range of 27-47 K and 2 × 1010-4 × 1011 cm-2, respectively. Conclusions. In PNe, the OH+ rotational line emission appears to be produced in the photodissociation region (PDR) in these objects. The emission of OH+ is observed only in PNe with hot central stars (Teff> 100 000 K), suggesting that high-energy photons may play a role in OH+ formation and its line excitation in these objects, as seems to be the case for ultraluminous galaxies.",

keywords = "Astrochemistry, Circumstellar matter, Planetary nebulae: general, Planetary nebulae: individual: NGC 6445, Planetary nebulae: individual: NGC 6720, Planetary nebulae: individual: NGC 6781",

author = "I. Aleman and T. Ueta and D. Ladjal and Exter, {K. M.} and Kastner, {J. H.} and R. Montez and Tielens, {A. G.G.M.} and Chu, {Y. H.} and H. Izumiura and I. McDonald and R. Sahai and N. Si{\'o}dmiak and R. Szczerba and {Van Hoof}, {P. A.M.} and E. Villaver and W. Vlemmings and M. Wittkowski and Zijlstra, {A. A.}",

year = "2014",

month = jun,

doi = "10.1051/0004-6361/201322940",

language = "English (US)",

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T2 - First detection of OH + in planetary nebulae

AU - Aleman, I.

AU - Ueta, T.

AU - Ladjal, D.

AU - Exter, K. M.

AU - Kastner, J. H.

AU - Montez, R.

AU - Tielens, A. G.G.M.

AU - Chu, Y. H.

AU - Izumiura, H.

AU - McDonald, I.

AU - Sahai, R.

AU - Siódmiak, N.

AU - Szczerba, R.

AU - Van Hoof, P. A.M.

AU - Villaver, E.

AU - Vlemmings, W.

AU - Wittkowski, M.

AU - Zijlstra, A. A.

PY - 2014/6

Y1 - 2014/6

N2 - Aims. We report the first detections of OH+ emission in planetary nebulae (PNe). Methods. As part of an imaging and spectroscopy survey of 11 PNe in the far-IR using the PACS and SPIRE instruments aboard the Herschel Space Observatory, we performed a line survey in these PNe over the entire spectral range between 51μm and 672μm to look for new detections. Results. The rotational emission lines of OH+ at 152.99, 290.20, 308.48, and 329.77μm were detected in the spectra of three planetary nebulae: NGC 6445, NGC 6720, and NGC 6781. Excitation temperatures and column densities derived from these lines are in the range of 27-47 K and 2 × 1010-4 × 1011 cm-2, respectively. Conclusions. In PNe, the OH+ rotational line emission appears to be produced in the photodissociation region (PDR) in these objects. The emission of OH+ is observed only in PNe with hot central stars (Teff> 100 000 K), suggesting that high-energy photons may play a role in OH+ formation and its line excitation in these objects, as seems to be the case for ultraluminous galaxies.

AB - Aims. We report the first detections of OH+ emission in planetary nebulae (PNe). Methods. As part of an imaging and spectroscopy survey of 11 PNe in the far-IR using the PACS and SPIRE instruments aboard the Herschel Space Observatory, we performed a line survey in these PNe over the entire spectral range between 51μm and 672μm to look for new detections. Results. The rotational emission lines of OH+ at 152.99, 290.20, 308.48, and 329.77μm were detected in the spectra of three planetary nebulae: NGC 6445, NGC 6720, and NGC 6781. Excitation temperatures and column densities derived from these lines are in the range of 27-47 K and 2 × 1010-4 × 1011 cm-2, respectively. Conclusions. In PNe, the OH+ rotational line emission appears to be produced in the photodissociation region (PDR) in these objects. The emission of OH+ is observed only in PNe with hot central stars (Teff> 100 000 K), suggesting that high-energy photons may play a role in OH+ formation and its line excitation in these objects, as seems to be the case for ultraluminous galaxies.

KW - Astrochemistry

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KW - Planetary nebulae: individual: NGC 6720

KW - Planetary nebulae: individual: NGC 6781

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