The CHESS spectral survey of star forming regions: Peering into the protostellar shock L1157-B1. I. Shock chemical complexity
C. Codella
(1)
,
B. Lefloch
(1)
,
C. Ceccarelli
(1)
,
J. Cernicharo
(2)
,
E. Caux
(3, 3)
,
A. Lorenzani
(4)
,
S. Viti
(1)
,
Pierre Hily-Blant
(1)
,
B. Parise
(3)
,
S. Maret
(1)
,
B. Nisini
(5)
,
P. Caselli
(4)
,
S. Cabrit
(6)
,
L. Pagani
(6)
,
M. Benedettini
(1)
,
A. Boogert
(1)
,
F. Gueth
(7)
,
G. Melnick
(1)
,
D. Neufeld
(1)
,
S. Pacheco
(1)
,
M. Salez
(1)
,
K. Schuster
(1)
,
A. Bacmann
(8)
,
Alain Baudry
(8)
,
T. Bell
(1)
,
E. A. Bergin
(9)
,
G. Blake
(10)
,
S. Bottinelli
(3)
,
Alain Castets
(1)
,
C. Comito
(11)
,
A. Coutens
(1)
,
N. Crimier
(1)
,
C. Dominik
(12)
,
K. Demyk
(1)
,
P. Encrenaz
(6)
,
E. Falgarone
(13)
,
A. Fuente
(1)
,
M. Gerin
(6, 13)
,
P. Goldsmith
(1)
,
F. Helmich
(1)
,
P. Hennebelle
(1)
,
Th. Henning
(14)
,
E. Herbst
(15, 16)
,
T. Jacq
(8)
,
C. Kahane
(1)
,
M. Kama
(1)
,
A. Klotz
(3, 17)
,
W. Langer
(1)
,
D. Lis
(1)
,
S. Lord
(1)
,
Justin Pearson
(1)
,
T. Phillips
(1)
,
P. Saraceno
(18)
,
P. Schilke
(11, 19)
,
X. Tielens
(1)
,
F. van Der Tak
(1)
,
M. van Der Wiel
(1)
,
C. Vastel
(3, 3)
,
Valentine Wakelam
(20)
,
A. Walters
(1)
,
F. Wyrowski
(21)
,
H. Yorke
(1)
,
C. Borys
(1)
,
Y. Delorme
(6)
,
C. Kramer
(22)
,
B. Larsson
(1)
,
I. Mehdi
(1)
,
V. Ossenkopf
(23, 24)
,
J. Stutzki
(19)
1
LAOG -
Laboratoire d'Astrophysique de Grenoble
2 CAB - Centro de Astrobiologia [Madrid]
3 CESR - Centre d'étude spatiale des rayonnements
4 OAA - INAF - Osservatorio Astrofisico di Arcetri
5 OAR - INAF - Osservatorio Astronomico di Roma
6 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
7 IRAM - Institut de RadioAstronomie Millimétrique
8 FORMATION STELLAIRE 2010
9 Department of Astronomy [Ann Arbor]
10 CALTECH - California Institute of Technology
11 Max Planck Institute for Radio Astronomy
12 AI PANNEKOEK - Astronomical Institute Anton Pannekoek
13 LRA - Laboratoire de Radioastronomie
14 MPIA - Max-Planck-Institut für Astronomie
15 OSU - Department of Physics [Ohio State University]
16 Ohio State Univ, Dept Astron & Chem, Columbus, OH 43210 USA
17 OHP - Observatoire de Haute-Provence
18 IFSI - Istituto di Fisica dello Spazio Interplanetario
19 I. Physikalisches Institut [Köln]
20 AMOR 2010
21 MPIFR - Max-Planck-Institut für Radioastronomie
22 IRAM - Instituto de RadioAstronomía Milimétrica
23 LUTH (UMR_8102) - Laboratoire Univers et Théories
24 SRON - SRON Netherlands Institute for Space Research
2 CAB - Centro de Astrobiologia [Madrid]
3 CESR - Centre d'étude spatiale des rayonnements
4 OAA - INAF - Osservatorio Astrofisico di Arcetri
5 OAR - INAF - Osservatorio Astronomico di Roma
6 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
7 IRAM - Institut de RadioAstronomie Millimétrique
8 FORMATION STELLAIRE 2010
9 Department of Astronomy [Ann Arbor]
10 CALTECH - California Institute of Technology
11 Max Planck Institute for Radio Astronomy
12 AI PANNEKOEK - Astronomical Institute Anton Pannekoek
13 LRA - Laboratoire de Radioastronomie
14 MPIA - Max-Planck-Institut für Astronomie
15 OSU - Department of Physics [Ohio State University]
16 Ohio State Univ, Dept Astron & Chem, Columbus, OH 43210 USA
17 OHP - Observatoire de Haute-Provence
18 IFSI - Istituto di Fisica dello Spazio Interplanetario
19 I. Physikalisches Institut [Köln]
20 AMOR 2010
21 MPIFR - Max-Planck-Institut für Radioastronomie
22 IRAM - Instituto de RadioAstronomía Milimétrica
23 LUTH (UMR_8102) - Laboratoire Univers et Théories
24 SRON - SRON Netherlands Institute for Space Research
C. Codella
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B. Lefloch
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J. Cernicharo
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E. Caux
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Pierre Hily-Blant
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S. Maret
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B. Nisini
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P. Caselli
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S. Cabrit
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A. Coutens
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C. Dominik
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A. Fuente
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P. Hennebelle
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Th. Henning
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P. Schilke
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Résumé
We present the first results of the unbiased survey of the L1157-B1 bow shock, obtained with HIFI in the framework of the key program Chemical HErschel Survey of Star forming regions (CHESS). The L1157 outflow is driven by a low-mass Class 0 protostar and is considered the prototype of the so-called chemically active outflows. The bright blue-shifted bow shock B1 is the ideal laboratory for studying the link between the hot (~1000-2000 K) component traced by H2 IR-emission and the cold (~10-20 K) swept-up material. The main aim is to trace the warm gas chemically enriched by the passage of a shock and to infer the excitation conditions in L1157-B1. A total of 27 lines are identified in the 555-636 GHz region, down to an average 3σ level of 30 mK. The emission is dominated by CO(5-4) and H2O(110-101) transitions, as discussed by Lefloch et al. in this volume. Here we report on the identification of lines from NH3, H2CO, CH3OH, CS, HCN, and HCO+. The comparison between the profiles produced by molecules released from dust mantles (NH3, H2CO, CH3OH) and that of H2O is consistent with a scenario in which water is also formed in the gas-phase in high-temperature regions where sputtering or grain-grain collisions are not efficient. The high excitation range of the observed tracers allows us to infer, for the first time for these species, the existence of a warm (≥200 K) gas component coexisting in the B1 bow structure with the cold and hot gas detected from ground. Herschel is an ESA space observatory with science instruments provided by European-led principal Investigator consortia and with important participation from NASA.Table 1 is only available in electronic form at http://www.aanda.org