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First detection of CHDOH towards pre-stellar cores
Yuxin Lin, Silvia Spezzano, Paola Caselli
The inheritance of material across the star and planet formation process is traced by deuterium fractionation. We report here the first detection of doubly deuterated methanol towa…
Gas phase Elemental abundances in Molecular cloudS (GEMS) VII. Sulfur elemental abundance
A. Fuente, P. Rivière-Marichalar, L. Beitia-Antero +18
Gas phase Elemental abundances in molecular CloudS (GEMS) is an IRAM 30m large program aimed at determining the elemental abundances of carbon (C), oxygen (O), nitrogen (N), and su…
The complex organic molecular content in the L1517B starless core
Andrés Megías, Izaskun Jiménez-Serra, Jesús Martín-Pintado +5
Recent observations of the pre-stellar core L1544 and the younger starless core L1498 have revealed that complex organic molecules (COMs) are enhanced in the gas phase toward their…
A large (~1 pc) contracting envelope around the prestellar core L1544
E. Redaelli, A. Chacón-Tanarro, P. Caselli +4
Prestellar cores, the birthplace of Sun-like stars, form from the fragmentation of the filamentary structure that composes molecular clouds, from which they must inherit at least p…
Chemistry and dynamics of the prestellar core L1544
O. Sipilä, P. Caselli, E. Redaelli +1
We aim to quantify the effect of chemistry on the infall velocity in the prestellar core L1544. Previous observational studies have found evidence for double-peaked line profiles f…
Tracing the contraction of the pre-stellar core L1544 with HCO = 1-0 emission
J. Ferrer Asensio, S. Spezzano, P. Caselli +6
Spectral line profiles of several molecules observed towards the pre-stellar core L1544 appear double-peaked. For abundant molecular species this line morphology has been linked to…
Nitrogen fractionation towards a pre-stellar core traces isotope-selective photodissociation
Silvia Spezzano, Paola Caselli, Olli Sipilä +1
Isotopologue abundance ratios are important to understand the evolution of astrophysical objects and ultimately the origins of a planetary system like our own. Being nitrogen a fun…
Deuteration of c-CH towards the pre-stellar core L1544
K. Giers, S. Spezzano, F. Alves +7
Context: In the centre of pre-stellar cores, the deuterium fractionation is enhanced due to the cold temperatures and high densities. Therefore, the chemistry of deuterated molecul…
Multi-line observations of CHOH, c-CH and HNCO towards L1544: Dissecting the core structure with chemical differentiation
Yuxin Lin, Silvia Spezzano, Olli Sipilä +2
Pre-stellar cores are the basic unit for the formation of stars and stellar systems. The anatomy of the physical and chemical structures of pre-stellar cores is critical for unders…
Gas phase Elemental abundances in Molecular cloudS (GEMS) VI. A sulphur journey across star-forming regions: study of thioformaldehyde emission
G. Esplugues, A. Fuente, D. Navarro-Almaida +10
In the context of the IRAM 30m Large Program GEMS, we present a study of thioformaldehyde in several starless cores located in star-forming filaments of Taurus, Perseus, and Orion.…
Mass ejection and time variability in protostellar outflows: Cep E. SOLIS XVI
A. de A. Schutzer, P. R. Rivera-Ortiz, B. Lefloch +46
Protostellar jets are an important agent of star formation feedback, tightly connected with the mass-accretion process. The history of jet formation and mass-ejection provides cons…
H2CS deuteration maps towards the pre-stellar core L1544
S. Spezzano, O. Sipilä, P. Caselli +7
Deuteration is a crucial tool to understand the complexity of interstellar chemical processes, especially when they involve the interplay of gas-phase and grain-surface chemistry.…
The Central 1000 au of a Pre-stellar Core Revealed with ALMA. II. Almost Complete Freeze-out
Paola Caselli, Jaime E. Pineda, Olli Sipilä +18
Pre-stellar cores represent the initial conditions in the process of star and planet formation. Their low temperatures (10 K) allow the formation of thick icy dust mantles, whic…