Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Olli Sipilä"'
Autor:
Maria Galloway-Sprietsma, Yancy L Shirley, James Di Francesco, Jared Keown, Samantha Scibelli, Olli Sipilä, Rachel Smullen
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 515:5219-5234
Understanding the chemical processes during starless core and prestellar core evolution is an important step in understanding the initial stages of star and disk formation. This project is a study of deuterated ammonia, o-NH$_2$D, in the L1251 star-f
Autor:
Elena Redaelli, Ana Chacón-Tanarro, Paola Caselli, Mario Tafalla, Jaime E. Pineda, Silvia Spezzano, Olli Sipilä
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 partially the kinematics. Furthermore, when they are on the verge of gr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5587da739041854bb93ce0ea35f74063
http://arxiv.org/abs/2210.13571
http://arxiv.org/abs/2210.13571
Autor:
Paola Caselli, Jaime E. Pineda, Olli Sipilä, Bo Zhao, Elena Redaelli, Silvia Spezzano, Maria José Maureira, Felipe Alves, Luca Bizzocchi, Tyler L. Bourke, Ana Chacón-Tanarro, Rachel Friesen, Daniele Galli, Jorma Harju, Izaskun Jiménez-Serra, Eric Keto, Zhi-Yun Li, Marco Padovani, Anika Schmiedeke, Mario Tafalla, Charlotte Vastel
Publikováno v:
The Astrophysical Journal
The Astrophysical Journal, 2022, 929, ⟨10.3847/1538-4357/ac5913⟩
The Astrophysical Journal, 2022, 929, ⟨10.3847/1538-4357/ac5913⟩
Pre-stellar cores represent the initial conditions in the process of star and planet formation. Their low temperatures ($
Comment: accepted for publication in The Astrophysical Journal
Comment: accepted for publication in The Astrophysical Journal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::351de0fc72d939a249748cc8f29633dd
http://arxiv.org/abs/2202.13374
http://arxiv.org/abs/2202.13374
Autor:
Jaime E. Pineda, Jorma Harju, Paola Caselli, Olli Sipilä, Mika Juvela, Charlotte Vastel, Erik Rosolowsky, Andreas Burkert, Rachel K. Friesen, Yancy Shirley, María José Maureira, Spandan Choudhury, Dominique M. Segura-Cox, Rolf Güsten, Anna Punanova, Luca Bizzocchi, Alyssa A. Goodman
Publikováno v:
Astronomical Journal
The Astronomical Journal
The Astronomical Journal, 2022, 163, ⟨10.3847/1538-3881/ac6be7⟩
The Astronomical Journal
The Astronomical Journal, 2022, 163, ⟨10.3847/1538-3881/ac6be7⟩
Spectral lines of ammonia, NH$_3$, are useful probes of the physical conditions in dense molecular cloud cores. In addition to advantages in spectroscopy, ammonia has also been suggested to be resistant to freezing onto grain surfaces, which should m
Context. Cosmic rays (CRs) play an important role in the chemistry and dynamics of the interstellar medium. In dense environments, they represent the main ionising agent, driving the rich chemistry of molecular ions and determining the ionisation fra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5829d45fc085e45854e2d4eb091b0797
http://arxiv.org/abs/2109.08169
http://arxiv.org/abs/2109.08169
Publikováno v:
DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
instname
instname
Most stars in the Galaxy, including the Sun, were born in high-mass star-forming regions. It is hence important to study the chemical processes in these regions to better understand the chemical heritage of both the Solar System and most stellar syst
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::36a496c79aa9b72b0e3f495d37f5d1e0
https://hdl.handle.net/20.500.12666/693
https://hdl.handle.net/20.500.12666/693
Non-thermal desorption of ices on interstellar grains is required to explain observations of molecules that are not synthesized efficiently in the gas phase in cold dense clouds. Perhaps the most important non-thermal desorption mechanism is one indu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c0b3af4cbf63aa340d9311fda185822b
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2020, 640, pp.A51. ⟨10.1051/0004-6361/202038251⟩
Astronomy & Astrophysics
Astronomy and Astrophysics-A&A, EDP Sciences, 2020, 640, pp.A51. ⟨10.1051/0004-6361/202038251⟩
Astronomy & Astrophysics
C-fractionation has been studied from a theoretical point of view with different models of time-dependent chemistry, including both isotope-selective photodissociation and low-temperature isotopic exchange reactions. Recent chemical models predict th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06fe956d7050279f194da57dd19728d6
http://arxiv.org/abs/2006.03362
http://arxiv.org/abs/2006.03362
Autor:
Hauyu Baobab Liu, Izaskun Jiménez-Serra, Guangxing Li, Qizhou Zhang, Zhi-Yu Zhang, Ken'ichi Tatematsu, P. Caselli, Di Li, Sheng-Yuan Liu, Henrik Beuther, Taylor Hogge, Xing Lu, Tie Liu, Patricio Sanhueza, J. Yuan, Olli Sipilä, Yu Wang, Siyi Feng, Y. C. Lin, Sarolta Zahorecz, Fujun Du, K. Wang
Publikováno v:
The Astrophysical Journal
DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
instname
Digital.CSIC. Repositorio Institucional del CSIC
Instituto Nacional de Técnica Aeroespacial (INTA)
DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
instname
Digital.CSIC. Repositorio Institucional del CSIC
Instituto Nacional de Técnica Aeroespacial (INTA)
The physical and chemical properties of cold and dense molecular clouds are key to understanding how stars form. Using the IRAM 30 m and NRO 45 m telescopes, we carried out a Multiwavelength line-Imaging survey of the 70 $��$m dark and bright clO
We constructed two new models for deuterium and spin-state chemistry for the purpose of modeling the low-temperature environment prevailing in starless and pre-stellar cores. The fundamental difference between the two models is in the treatment of io
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a205c6812618a2ceb51eab2c8a33800
http://arxiv.org/abs/1909.04341
http://arxiv.org/abs/1909.04341