CHESS, Chemical Herschel surveys of star forming regions:Peering into the protostellar shock L1157-B1
B. Lefloch, S. Cabrit, C. Codella, G. Melnick, J. Cernicharo, E. Caux,, M. Benedettini, A. Boogert, P. Caselli, C. Ceccarelli, F. Gueth, P., Hily-Blant, A. Lorenzani, D. Neufeld, B. Nisini, S. Pacheco, L. Pagani, J.R., Pardo, B. Parise, M. Salez, K. Schuster, S. Viti, A. Bacmann

TL;DR
This study presents the first unbiased spectral survey of the protostellar shock L1157-B1, revealing distinct physical conditions and chemical enrichment in different regions, and supporting C-shock model predictions.
Contribution
It provides new high-resolution spectral data of L1157-B1, identifying two regions with different physical and chemical properties, and confirms shock models with observational evidence.
Findings
Detection of broad wings in CO and H2O lines indicating high-velocity gas.
Identification of a warm, dense low-velocity component and a hot, moderate-density high-velocity component.
Water abundance increases by two orders of magnitude between the two components.
Abstract
The outflow driven by the low-mass class 0 protostar L1157 is the prototype of the so-called chemically active outflows. The bright bowshock B1 in the southern outflow lobe is a privileged testbed of magneto-hydrodynamical (MHD) shock models, for which dynamical and chemical processes are strongly interdependent. We present the first results of the unbiased spectral survey of the L1157-B1 bowshock, obtained in the framework of the key program "Chemical Herschel Surveys of Star Forming Regions" (CHESS). The main aim is to trace the warm and chemically enriched gas and to infer the excitation conditions in the shock region. The CO 5-4 and H2O lines have been detected at high-spectral resolution in the unbiased spectral survey of the HIFI-Band 1b spectral window (555-636 GHz), presented by Codella et al. in this volume. Complementary ground-based observations in the submm window help…
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