Article
Astronomy & Astrophysics
Zhiyuan Ren, Lei Zhu, Hui Shi, Nannan Yue, Di Li, Qizhou Zhang, Diego Mardones, Jingwen Wu, Sihan Jiao, Shu Liu, Gan Luo, Jinjin Xie, Chao Zhang, Xuefang Xu
Summary: The study of filamentary structures in the Orion A molecular cloud region OMC-3 MMS-7 using ALMA and SMA observations revealed close associations with star-forming cores. The analysis of N2H+ emission showed dense filaments intersecting at the central core MMS-7, indicating an inward motion towards pre-stellar core formation. This filament contraction may lead to the generation of intermediate-mass or high-mass stars, with a steady and less intense process compared to global spherical collapses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Hannah E. Ambrose, Yancy L. Shirley, Samantha Scibelli
Summary: Recent observations show that organic molecules are common in starless and pre-stellar cores, and deuterated organic molecules have not been well studied during the starless phase. An investigation of deuterated methanol towards 12 cores in the Taurus molecular cloud region indicates that deuterium fractionation of organic molecules during the starless phase might be more easily detectable than previously thought.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
K. Giers, S. Spezzano, F. Alves, P. Caselli, E. Redaelli, O. Sipilae, M. Ben Khalifa, L. Wiesenfeld, S. Brunken, L. Bizzocchi
Summary: This study investigates the distribution of deuterated molecules in the pre-stellar core L1544 using emission maps of cyclopropenylidene. The results show that the highest deuterium fractions are found near the dust peak at the center of L1544, indicating a more efficient deuteration process in the core's center. The study also suggests the presence of carbon-chain molecules at high densities.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
B. Riaz, W-F Thi, M. N. Machida
Summary: We conducted the first molecular line survey to search for methanol (CH3OH) in 14 Class 0/I protobrown dwarfs (proto-BDs). The results showed emission in 14 CH3OH transition lines, with upper state energy levels ranging from 7-49 K and critical densities of 10(5)-10(9) cm(-3). The high-excitation lines likely probe the warm corino region in the proto-BDs, while the low-excitation lines trace the cold gas. The column density for the cold component is higher than the warm component, and the ortho-to-para ratios of CH3OH range between 0.3 and 2.3.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
B. Riaz, M. N. Machida
Summary: ALMA observations of the (CO)-C-12 (2-1), (CO)-C-13 (2-1), and (CO)-O-18 (2-1) molecular lines in the very young proto-brown dwarf system ISO-OPH 200 reveal complex internal structures. Physical+chemical modelling suggests that ISO-OPH 200 is likely an early Class 0 stage system formed via a star-like mechanism.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
B. Riaz, W-F Thi
Summary: Deuterium fractionation can provide insights into the physical and chemical conditions during the early stage of brown dwarf formation. Observations of formaldehyde isotopologues in proto-brown dwarfs reveal similar abundance ratios of D2CO/HDCO, HDCO/H2CO, and D2CO/H2CO as seen in low-mass protostars, suggesting the formation of HDCO and D2CO through grain surface reactions in the cold interiors of proto-brown dwarfs at an early stage of formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
B. Riaz, W-F Thi
Summary: In this study, a detailed observational survey of deuterated species in proto-brown dwarfs and brown dwarfs was conducted. The results show higher ratios and narrower ranges for certain deuterium-hydrogen ratios, indicating the importance of both gas-phase and grain surface reactions in deuterium fractionation. The dense and cold interior of proto-brown dwarfs provides suitable conditions for efficient deuterium fractionation, with no correlation between deuterium-hydrogen ratios and evolutionary stage or CO depletion factors.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jaeyeon Kim, Melanie Chevance, J. M. Diederik Kruijssen, Adam K. Leroy, Andreas Schruba, Ashley T. Barnes, Frank Bigiel, Guillermo A. Blanc, Yixian Cao, Enrico Congiu, Daniel A. Dale, Christopher M. Faesi, Simon C. O. Glover, Kathryn Grasha, Brent Groves, Annie Hughes, Ralf S. Klessen, Kathryn Kreckel, Rebecca McElroy, Hsi-An Pan, Jerome Pety, Miguel Querejeta, Alessandro Razza, Erik Rosolowsky, Toshiki Saito, Eva Schinnerer, Jiayi Sun, Neven Tomi, Antonio Usero, Thomas G. Williams
Summary: The processes of star formation and feedback play a major role in governing galaxy evolution by regulating the cycle of matter between gas and stars. By studying the evolutionary timeline of giant molecular clouds (GMCs), it is found that clouds live for about 1-3 GMC turbulence crossing times and are efficiently dispersed by stellar feedback within 1-5 Myr once the star-forming region becomes partially exposed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. Avison, G. A. Fuller, N. Asabre Frimpong, S. Etoka, M. Hoare, B. M. Jones, N. Peretto, A. Traficante, F. van der Tak, J. E. Pineda, M. Beltran, F. Wyrowski, M. Thompson, S. Lumsden, Z. Nagy, T. Hill, S. Viti, F. Fontani, P. Schilke
Summary: The role of massive stars in shaping the interstellar medium in their host galaxy is significant. This study presents a sample of massive star-forming regions observed with ALMA and explores their fragmentation, clustering, and flux density properties. The sample contains multiple fragments per field, and the fragmentation scales are often larger than the thermal Jeans length. Furthermore, a tentative evolutionary trend is observed between the clump luminosity and the spectral line richness of the fields.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. M. Vazzano, M. Fernandez-Lopez, A. Plunkett, I. De Gregorio-Monsalvo, A. Santamaria-Miranda, S. Takahashi, C. Lopez
Summary: The study aims to test the coherence between commonly used evolutionary tracers by observing seven objects in the Lupus clouds at different evolutionary stages. The findings reveal that the evolutionary classification aligns with previous studies except for one source, suggesting a need for more detailed observations to refine classifications. The study also indicates that the most common evolutionary tracers in the literature are useful for broad classifications but lack consistency to differentiate sources within the same Class.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
R. Carini, K. Biazzo, G. De Marchi, N. Panagia, G. Beccari, E. Brocato
Summary: In this study, the accretion properties of low-mass pre-main sequence stars in the LH 91 association within the Large Magellanic Clouds are investigated using optical multiband photometry obtained with the Hubble Space Telescope. The age distribution suggests a period of active star formation ranging from a few million years up to approximately 60 million years, with a gap between 5 million years and 10 million years. The masses of the pre-main sequence candidates range from 0.2 solar masses to 1.0 solar mass, with an average of approximately 0.80 solar mass. The results also show variations in accretion luminosity and mass accretion rate with the age of the stars. Comparison with LH 95 reveals that LH 91 appears to be in a more evolved stage. Additionally, the pre-main sequence candidates are found to be uniformly distributed without any evidence of clumps around more massive stars.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Guang-Xing Li, Xun Shi
Summary: Research shows that the gravitational interaction between compact objects passing through molecular clouds and the ambient gas can lead to the formation of thin and collimated features made of dense gas, known as 'molecular contrails'. The width of these contrails is determined by the mass and velocity of the compact object as well as the velocity dispersion of the ambient molecular medium. This study highlights a previously overlooked channel where stars and gas in the Galactic disc interact to form structures, and also presents a potential method for detecting dark compact objects in the Milky Way.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
B. Riaz, J. Bally
Summary: The study found that Class 0 proto-brown dwarfs have predominantly molecular jet activity, while Class I proto-brown dwarfs show an evolutionary trend in their jets from molecular to ionic composition. The accretion rates and mass-loss rates of proto-BDs fall within a certain range, higher than Class II brown dwarfs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Clemence Fontanive, Luigi R. Bedin, Matthew De Furio, Beth Biller, Jay Anderson, Mariangela Bonavita, Katelyn Allers, Blake Pantoja
Summary: By conducting an imaging search using the Hubble Space Telescope, we investigated the presence of low-mass binary and planetary companions to 33 nearby brown dwarfs with spectral types of T8-Y1. Despite our deep sensitivity, we found no companions to these substellar primaries. Our results indicate that companions are extremely rare around the lowest mass and coldest isolated brown dwarfs, supporting the trend of decreasing binary fraction with primary mass observed throughout the stellar and substellar regimes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Vlasblom, G. De Marchi
Summary: We studied the young stellar populations in the NGC 299 cluster in the Small Magellanic Cloud using observations obtained with the Hubble Space Telescope in three different bands. We identified pre-main-sequence (PMS) objects still undergoing active accretion and determined their physical stellar parameters. Our findings suggest the existence of two populations of PMS stars with different ages and support the idea that the metallicity and density of the forming environment can affect the star formation process. The spatial distribution of massive stars and PMS objects in the cluster suggests a possible dispersal of the latter due to two-body relaxation.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Deborah Baines, Fabrizio Giordano, Elena Racero, Jesus Salgado, Belen Lopez Marti, Bruno Merin, Maria-Henar Sarmiento, Raul Gutierrez, Inaki Ortiz de Landaluce, Ignacio Leon, Pilar de Teodoro, Juan Gonzalez, Sara Nieto, Juan Carlos Segovia, Andy Pollock, Michael Rosa, Christophe Arviset, Daniel Lennon, William O'Mullane, Guido de Marchi
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
(2017)
Article
Astronomy & Astrophysics
N. Huelamo, G. Chauvin, H. M. Schmid, S. P. Quanz, E. Whelan, J. Lillo-Box, D. Barrado, B. Montesinos, J. M. Alcala, M. Benisty, I. de Gregorio-Monsalvo, I. Mendigutia, H. Bouy, B. Merin, J. de Boer, A. Garufi, E. Pantin
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
S. Wilkinson, B. Merin, P. Riviere-Marichalar
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
Z. H. Zhang, D. J. Pinfield, M. C. Galvez-Ortiz, D. Homeier, A. J. Burgasser, N. Lodieu, E. L. Martin, M. R. Zapatero Osorio, F. Allard, H. R. A. Jones, R. L. Smart, B. Lopez Marti, B. Burningham, R. Rebolo
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
N. Huelamo, G. Chauvin, H. M. Schmid, S. P. Quanz, E. Whelan, J. Lillo-Box, D. Barrado, B. Montesinos, J. M. Alcala, M. Benisty, I. de Gregorio-Monsalvo, I. Mendigutia, H. Bouy, B. Merin, J. de Boer, A. Garufi, E. Pantin
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
S. Wilkinson, B. Merin, P. Riviere-Marichalar
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
F. Giordano, E. Racero, H. Norman, R. Valles, B. Merin, D. Baines, M. Lopez-Caniego, B. L. Marti, P. de Teodoro, J. Salgado, M. H. Sarmiento, R. Gutierrez-Sanchez, R. Prieto, A. Lorca, S. Alberola, I Valtchanov, G. de Marchi, R. Alvarez, C. Arviset
ASTRONOMY AND COMPUTING
(2018)
Article
Astronomy & Astrophysics
Z. H. Zhang, M. C. Galvez-Ortiz, D. J. Pinfield, A. J. Burgasser, N. Lodieu, H. R. A. Jones, E. L. Martin, B. Burningham, D. Homeier, F. Allard, M. R. Zapatero Osorio, L. C. Smith, R. L. Smart, B. Lopez Marti, F. Marocco, R. Rebolo
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
H. Canovas, C. Cantero, L. Cieza, A. Bombrun, U. Lammers, B. Merin, A. Mora, A. Ribas, D. Ruiz-Rodriguez
ASTRONOMY & ASTROPHYSICS
(2019)
Article
Astronomy & Astrophysics
E. Racero, F. Giordano, B. Carry, J. Berthier, T. Mueller, M. Mahlke, I Valtchanov, D. Baines, S. Kruk, B. Merin, S. Besse, M. Kueppers, E. Puga, J. Gonzalez Nunez, P. Rodriguez, I de la Calle, B. Lopez-Marti, H. Norman, M. Wangblad, M. Lopez-Caniego, N. Alvarez Crespo
Summary: This study aims to provide a search service for the scientific community to detect Solar System objects (SSOs) in the European Space Agency (ESA) astronomical archives. By using a geometric cross-match of the orbital path and imaging data, a large number of targeted and serendipitous SSOs observations have been collected, facilitating scientific analysis and research.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Sandor Kruk, Pablo Garcia Martin, Marcel Popescu, Bruno Merin, Max Mahlke, Benoit Carry, Ross Thomson, Samet Karadag, Javier Duran, Elena Racero, Fabrizio Giordano, Deborah Baines, Guido de Marchi, Rene Laureijs
Summary: The study aimed to identify asteroids in archival images from the European Space Agency Hubble Space Telescope Science data archive using data mining techniques. The research successfully detected 1701 new asteroid trails and explored the ESA Hubble Space Telescope science data archive with machine learning, enriching the sample available for asteroid research.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
David O'Ryan, Bruno Merin, Brooke D. Simmons, Antonia Vojtekova, Anna Anku, Mike Walmsley, Izzy L. Garland, Tobias Geron, William Keel, Sandor Kruk, Chris J. Lintott, Kameswara Bharadwaj Mantha, Karen L. Masters, Jan Reerink, Rebecca J. Smethurst, Matthew R. Thorne
Summary: Mergers play a crucial role in galaxy formation and evolution. This study uses the ESA Datalabs platform to create a larger catalog of interacting galaxies from the Hubble Space Telescope science archives. By utilizing the Zoobot convolutional neural network, the researchers make probabilistic interaction predictions for 126 million sources from the Hubble Source Catalog. The study not only provides valuable insights into interacting galaxy systems, but also demonstrates the efficiency of ESA Datalabs in facilitating archival analysis.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Sandor Kruk, Pablo Garcia-Martin, Marcel Popescu, Ben Aussel, Steven Dillmann, Megan E. Perks, Tamina Lund, Bruno Merin, Ross Thomson, Samet Karadag, Mark J. McCaughrean
Summary: The recent launch of low Earth orbit satellite constellations is posing a growing threat to ground-based astronomical observations, causing concerns among the astronomical community. By analyzing Hubble Space Telescope images from 2002 to 2021 with the help of citizen scientists and a deep learning algorithm, we found that 2.7% of the individual exposures were contaminated by satellite trails, and this fraction is expected to increase with the growing number of artificial satellites in the next decade. Further study and monitoring are needed to address this issue.
Proceedings Paper
Astronomy & Astrophysics
Jesus Salgado, Bruno Merin, Fabrizio Giordano, Deborah Baines, Elena Racero, Belen Lopez Marti, Maria H. Sarmiento, Raul Gutierrez-Sanchez
ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS XXVI
(2019)
Proceedings Paper
Astronomy & Astrophysics
Elena Racero, Fabrizio Giordano, Benoit Carry, Jerome Berthier, Juan Gonzalez, Henrik Norman, Deborah Baines, Bruno Merin, Belen Lopez Marti, Marcos Lopez-Caniego, Pilar de Teodoro, Jesus Salgado, Christophe Arviset
ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS XXVIII
(2019)