Article
Astronomy & Astrophysics
J. M. Y. Woo, R. Brasser, S. L. Grimm, M. L. Timpe, J. Stadel
Summary: Recent advancements in GPU hardware and N-body simulation code GENGA have allowed for unprecedented resolution in simulations of planet formation. This study reports high-resolution N-body simulations of terrestrial planet formation under different assumptions, revealing discrepancies in the inner solar system structure and isotopic differences. The results suggest the need to consider alternative initial conditions to explain the giant impacts and leftover planetesimals in the solar system.
Article
Astronomy & Astrophysics
Yi-Han Wang, Rosalba Perna, Nathan W. C. Leigh, Michael M. Shara
Summary: Exoplanetary observations show that the occurrence of hot Jupiters is related to star clustering. Interactions between planetary systems and close flyby stars in star clusters can change the structure of primordially coplanar, circular planetary systems. This study focuses on the formation of hot Jupiters in multiplanet systems, using high-precision simulations. The results demonstrate that a single close flyby can activate secular chaos and lead to hot Jupiter formation through high-eccentricity migration. The formation rate of hot Jupiters is influenced by the size of the planetary system and the mass of the outer planet. Clusters with low density are more likely to have flyby-induced secular chaos, which contributes significantly to hot Jupiter formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Geochemistry & Geophysics
Matthew C. Brennan, Rebecca A. Fischer, Francis Nimmo, David P. O'Brien
Summary: Determining how and when Mars formed has been a challenge for planetary scientists. Recent analyses using hafnium-tungsten isotopes suggest rapid core formation within a few million years of solar system formation. Different accretion conditions can produce Mars-like isotopic compositions, with oxygen fugacity playing a key role. The timing of accretion is crucial for Mars' isotopic constraints.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Astronomy & Astrophysics
Yu-Chia Lin, Yuji Matsumoto, Pin-Gao Gu
Summary: Recent observations have shown the presence of multiple-planet systems around late M dwarfs, with planets commonly trapped in resonant chains. Research indicates that understanding the protoplanet appearance timescale is crucial for determining the number of planets and their resonance trapping.
ASTROPHYSICAL JOURNAL
(2021)
Article
Engineering, Aerospace
Matteo Caruso, Luigi Bregant, Paolo Gallina, Stefano Seriani
Summary: This paper presents the novel planetary rover prototype Archimede and its characteristics. The dynamics of the rover are analyzed using the Kane's method and a validated analytical model. The results show good adherence between the models, validating the approach.
Article
Multidisciplinary Sciences
Lewis J. Conway, Chris J. Pickard, Andreas Hermann
Summary: Research shows that under high-pressure conditions, compounds in the H-C-N-O system follow simple chemical rules, explaining why the simplest quaternary mixture HCNO- emerges as a stable compound.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Astronomy & Astrophysics
A. Niedzielski, E. Villaver, M. Adamow, K. Kowalik, A. Wolszczan, G. Maciejewski
Summary: This project aims to detect and characterize planetary-mass companions to solar-mass stars in a sample of 122 targets and study relationships between stellar properties, such as metallicity, luminosity, and planet occurrence rate. Through precise radial velocity measurements, the analysis of four solar-mass stars shows the presence of companions and correlations between RV variations and stellar activity indicators.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Leonid Pogorelyuk, Riley Fitzgerald, Sophia Vlahakis, Rhonda Morgan, Kerri Cahoy
Summary: We developed a deconfuser tool to test plausible partitions of planet detections in high-contrast images from future space-based telescopes. By applying the deconfuser to simulated observations, we found that four observations are generally sufficient to avoid confusion, except for systems with high inclinations. The deconfuser will be integrated into mission simulation tools for assessing the risk of confusion in future missions.
ASTROPHYSICAL JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Khaled Mohamed, Hesham Elkaranshawy, Ahmed Ashour, Hassan Alkomy
Summary: The research specifies the condition leading to the Painleve paradox and investigates factors affecting it through parametric studies of two sliding manipulators. Recommendations are proposed to avoid the paradox, including a novel conjecture involving rearranging the joints of the robot.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Engineering, Aerospace
Patrick K. King, Megan Bruck Syal, David S. P. Dearborn, Robert Managan, J. Michael Owen, Cody Raskin
Summary: This study evaluates fragment orbits in the gravitational system using a new simulation method and finds that disruption can be an effective planetary defense strategy, even with late interventions.
Article
Astronomy & Astrophysics
O. Panic, T. J. Haworth, M. G. Petr-Gotzens, J. Miley, M. van den Ancker, M. Vioque, L. Siess, R. Parker, C. J. Clarke, I Kamp, G. Kennedy, R. D. Oudmaijer, I Pascucci, A. M. S. Richards, T. Ratzka, C. Qi
Summary: This study characterizes the individual discs in intermediate-separation binary systems at millimeter wavelengths. Asymmetries were found in the outer regions of primary discs, indicating potential perturbation by companions. Dust masses were high while gas masses were very low, suggesting giant planet formation may not be possible in these systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
O. Panic, T. J. Haworth, M. G. Petr-Gotzens, J. Miley, M. van den Ancker, M. Vioque, L. Siess, R. Parker, C. J. Clarke, I Kamp, G. Kennedy, R. D. Oudmaijer, I Pascucci, A. M. S. Richards, T. Ratzka, C. Qi
Summary: This study presents the first characterization of individual discs in the intermediate-separation binary systems KK Oph and HD 144668 at millimetre wavelengths. The disc structures show large-scale asymmetries, with dust masses above debris disc level and gas masses below the possibility of forming giant planets. This raises questions about the potential influence of binarity on gas removal and disc truncation in intermediate-separation binaries.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Matias Montesinos, Nicolas Cuello, Johan Olofsson, Jorge Cuadra, Amelia Bayo, Gesa H. -M. Bertrang, Clement Perrot
Summary: Recent data from ALMA/SPHERE show evidence of potential planets in young star disks, such as co-moving point sources and gravitational perturbations. To interpret these findings, a robust physical framework is needed to deduce the complex geometry of the disks. Current protoplanetary disk models often overlook the effects of radiative pressure fields, potentially leading to a misinterpretation of the true vertical structure of these disks.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Diptajyoti Mukherjee, Qirong Zhu, Hy Trac, Carl L. Rodriguez
Summary: This study demonstrates that using Taichi for collision simulations of star clusters can accurately model collision effects and is more efficient than other CPU-based codes. Future improvements in handling close encounters and binary evolution show potential for studying large stellar cluster systems.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Sheng Yang, Liangyu Wu, Zekai Zheng, Masahiro Ogihara, Kangrou Guo, Wenzhan Ouyang, Yaxing He
Summary: Studying the orbital stability of multi-planet systems is crucial for understanding planet formation, estimating stable time, and advancing population synthesis models. This study investigates the dynamical stability of non-uniform separation systems. A system with 10 planets and varying orbital separations was simulated, showing that reducing one pair of spacing led to significantly shorter orbital crossing times. The first collisions were closely associated with the initially closest separation pair. Updating formulas derived for evenly spaced systems is necessary in realistic situations.
Article
Astronomy & Astrophysics
Carles G. Palau, Jordi Miralda-Escude
Summary: The study detected a tidal stream generated by the globular cluster NGC 3201, with most of it being the trailing one. By analyzing high-quality data, approximately 200 possible member stars were identified, with 170 of them showing consistency with the cluster members after corrections.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Y. Shan, A. Reiners, D. Fabbian, E. Marfil, D. Montes, H. M. Tabernero, I. Ribas, J. A. Caballero, A. Quirrenbach, P. J. Amado, J. Aceituno, V. J. S. Bejar, M. Cortes-Contreras, S. Dreizler, A. P. Hatzes, Th. Henning, S. V. Jeffers, A. Kaminski, M. Kuerster, M. Lafarga, J. C. Morales, E. Nagel, E. Palle, V. M. Passegger, C. Rodriguez-Lopez, A. Schweitzer, M. Zechmeister
Summary: Analyzing high-resolution M-dwarf spectra from the CARMENES survey, we determined vanadium abundances and suggest its potential as an alternative metallicity indicator in these cool stars. Neglecting to model hyperfine structure may partially explain the temperature correlation observed in vanadium abundance measurements.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Alejandro Diaz-Morcillo, Jose Maria Garcia Barcelo, Antonio Jose Lozano Guerrero, Pablo Navarro, Benito Gimeno, Sergio Arguedas Cuendis, Alejandro Alvarez Melcon, Cristian Cogollos, Sergio Calatroni, Babette Doebrich, Juan Daniel Gallego-Puyol, Jessica Golm, Igor Garcia Irastorza, Chloe Malbrunot, Jordi Miralda-Escude, Carlos Pena Garay, Javier Redondo, Walter Wuensch
Summary: This review discusses the work carried out by the RADES group in the past five years, including the development of sensitive detection systems, data acquisition design, and the first experimental run. The future work planned by the RADES group in dipole and solenoid magnets is also presented.
Article
Astronomy & Astrophysics
D. Baroch, A. Gimenez, J. C. Morales, I Ribas, E. Herrero, V Perdelwitz, C. Jordi, T. Granzer, C. Allende Prieto
Summary: Using TESS data and spectroscopic observations, this study determined the masses and radii of the eccentric eclipsing binary systems V889 Aql and V402 Lac, and identified the possible presence of a third body in each system. The results are consistent with the predictions of theoretical models.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Samantha Youles, Julian E. Bautista, Andreu Font-Ribera, David Bacon, James Rich, David Brooks, Tamara M. Davis, Kyle Dawson, Axel de la Macorra, Govinda Dhungana, Peter Doel, Kevin Fanning, Enrique Gaztanaga, Satya Gontcho A. Gontcho, Alma X. Gonzalez-Morales, Julien Guy, Klaus Honscheid, Vid Irsic, Robert Kehoe, David Kirkby, Theodore Kisner, Martin Landriau, Laurent Le Guillou, Michael E. Levi, Paul Martini, Andrea Munoz-Gutierrez, Nathalie Palanque-Delabrouille, Ignasi Perez-Rafols, Claire Poppett, Cesar Ramirez-Perez, Michael Schubnell, Gregory Tarle, Michael Walther
Summary: In this study, the impact of errors in quasar redshift estimation on Lyman-alpha correlation functions is investigated using synthetic Lyman-alpha forests from the DESI survey. The results show that redshift errors lead to a smearing of the BAO feature in the radial direction and an unphysical correlation for small separations transverse to the line of sight.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. Orell-Miquel, G. Nowak, F. Murgas, E. Palle, G. Morello, R. Luque, M. Badenas-Agusti, I Ribas, M. Lafarga, N. Espinoza, J. C. Morales, M. Zechmeister, A. Alqasim, W. D. Cochran, D. Gandolfi, E. Goffo, P. Kabath, J. Korth, K. W. F. Lam, J. Livingston, A. Muresan, C. M. Persson, V. Van Eylen
Summary: HD 191939 is a nearby, bright, and inactive Sun-like star known to host a multi-planet system. A new non-transiting planet (HD 191939 g) was discovered in the system, and the mass of HD 191939 d was refined. The planetary system consists of three sub-Neptunes, a Saturn-mass planet, an Uranus-mass planet, and a high-mass long-period companion.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Marc Oncins, Jordi Miralda-Escude, Jordi L. Gutierrez, Pilar Gil-Pons
Summary: By calculating, it is found that a high fraction of low-metallicity stars formed in the first dwarf galaxies at redshift z around 20 could capture primordial black holes, which may have significant implications for our understanding of stellar evolution, dark matter, and the early Universe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Beatriz Aja, Sergio Arguedas Cuendis, Ivan Arregui, Eduardo Artal, R. Belen Barreiro, Francisco J. Casas, Marina C. de Ory, Alejandro Diaz-Morcillo, Luisa de la Fuente, Juan Daniel Gallego, Jose Maria Garcia-Barcelo, Benito Gimeno, Alicia Gomez, Daniel Granados, Bradley J. Kavanagh, Miguel A. G. Laso, Txema Lopetegi, Antonio Jose Lozano-Guerrero, Maria T. Magaz, Jesus Martin-Pintado, Enrique Martinez-Gonzalez, Jordi Miralda-Escude, Juan Monzo-Cabrera, Francisco Najarro de la Parra, Jose R. Navarro-Madrid, Ana B. Nunez Chico, Juan Pablo Pascual, Jorge Pelegrin, Carlos Pena Garay, David Rodriguez, Juan M. Socuellamos, Fernando Teberio, Jorge Teniente, Patricio Vielva, Ivan Vila, Rocio Vilar, Enrique Villa
Summary: This article proposes a novel experiment, the Canfranc Axion Detection Experiment (CADEx), to study dark matter axions with masses in the range of 330-460 mu eV. The experiment will use a microwave resonant cavity detector and a highly sensitive detecting system, and is expected to be conducted in the dilution refrigerator of the Canfranc Underground Laboratory.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Francesca Gerardi, Andrei Cuceu, Andreu Font-Ribera, Benjamin Joachimi, Pablo Lemos
Summary: When analyzing Lyman alpha three-dimensional correlation functions, standard methods only consider the information from the distinct peak caused by baryon acoustic oscillations. This study investigates whether this compression is enough to capture all the relevant cosmological information. By directly fitting the full shape of synthetic Lyman alpha autocorrelation functions and cross-correlations with quasars, including all physical scales without compression, our approach provides significantly better constraints on parameters like the matter density and the growth term compared to using BAO alone.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Christopher J. Manser, Boris T. Gansicke, Keith Inight, Akshay Robert, S. Ahlen, C. Allende Prieto, D. Brooks, A. P. Cooper, A. de la Macorra, A. Font-Ribera, K. Honscheid, T. Kisner, M. Landriau, Aaron M. Meisner, R. Miquel, Jundan Nie, C. Poppett, Gregory Tarle, Zhimin Zhou
Summary: A new class of white dwarfs, called DAHe, has been discovered to have Zeeman-split Balmer lines in emission, but the origins of these emission lines are still unknown. By studying a sample of 21 newly identified DAHe systems, researchers have determined the magnetic field strengths and rotation periods of these systems. These DAHe systems cluster together on the Gaia Hertzsprung-Russell diagram and represent about 1% of white dwarfs in that region.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Claire Lamman, Daniel Eisenstein, Jessica Nicole Aguilar, David Brooks, Axel de la Macorra, Peter Doel, Andreu Font-Ribera, Satya Gontcho A. Gontcho, Klaus Honscheid, Robert Kehoe, Theodore Kisner, Anthony Kremin, Martin Landriau, Michael Levi, Ramon Miquel, John Moustakas, Nathalie Palanque-Delabrouille, Claire Poppett, Michael Schubnell, Gregory Tarle
Summary: We measure the tidal alignment of luminous red galaxies (LRGs) and predict the redshift-space distortion signature in the Dark Energy Spectroscopic Instrument (DESI) survey. By using photometric redshifts and a linear tidal model, we forecast a 0.5% decrease in the quadrupole of the two-point correlation function for projected separations of 40-80 h(-1) Mpc.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Alice M. Eltvedt, T. Shanks, N. Metcalfe, B. Ansarinejad, L. F. Barrientos, R. Sharp, U. Malik, D. N. A. Murphy, M. Irwin, M. Wilson, D. M. Alexander, Andras Kovacs, Juan Garcia-Bellido, Steven Ahlen, David Brooks, Axel de la Macorra, Andreu Font-Ribera, Satya Gontcho a Gontcho, Klaus Honscheid, Aaron Meisner, Ramon Miquel, Jundan Nie, Gregory Tarle, Mariana Vargas-Magana, Zhimin Zhou
Summary: We present the VST ATLAS Quasar Survey, which includes over 1,229,000 quasar (QSO) candidates with 16 < g < 22.5 over an area of approximately 4,700 square degrees. The survey aims to reach a QSO sky density of 130 deg-2 for z < 2.2 and about 30 deg-2 for z > 2.2. The selection of candidates is guided by X-ray/UV/optical/MIR data in the William Herschel Deep Field (WHDF) and we find that about 25% of the QSOs are morphologically classified as optically extended. In terms of completeness and contamination, MIR, UV, and X-ray selections are 70-90% complete, with X-ray suffering less contamination than MIR and UV.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Naim Goksel Karacayli, Paul Martini, David H. Weinberg, Vid Irsic, J. Aguilar, S. Ahlen, D. Brooks, A. de la Macorra, A. Font-Ribera, S. Gontcho A. Gontcho, J. Guy, T. Kisner, R. Miquel, C. Poppett, C. Ravoux, M. Schubnell, G. Tarle, B. A. Weaver, Z. Zhou
Summary: Measuring the abundance, temperature, and clustering of metals in the intergalactic medium is crucial for understanding the cosmic evolution and its impact on cosmological analysis with the Ly alpha forest. Existing methods tend to provide biased results, and hence, we propose an alternative approach that utilizes two-point statistics to measure these properties in an unbiased manner. Our initial results, based on data from DESI and high-resolution spectra, indicate evidence for higher C IV abundance and abundance evolution over time. The future use of DESI data will allow us to further investigate the growth of clustering and test DESI analysis infrastructure.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Boryana Hadzhiyska, A. Font-Ribera, A. Cuceu, S. Chabanier, J. Aguilar, D. Brooks, A. de la Macorra, P. Doel, D. J. Eisenstein, J. E. Forero-Romero, S. Gontcho A. Gontcho, K. Honscheid, R. Kehoe, M. Landriau, R. Miquel, Jundan Nie, W. J. Percival, G. Rossi, Gregory Tarle, Zhimin Zhou
Summary: The full-shape correlations of the Lyman alpha forest can provide valuable cosmological information. To analyze them accurately, we use the N-body simulation suite AbacusSummit to generate high-resolution Lyman alpha skewers and quasi-stellar object (QSO) catalogues. Our mocks aim to assist the Dark Energy Spectroscopic Instrument (DESI) team in their analysis of the Lyman alpha forest. We calibrate our skewers by comparing them to power spectra from a hydrodynamical simulation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Juan Carlos Morales, Ignasi Ribas, Alvaro Gimenez, David Baroch
Summary: The analysis of eclipsing binary systems has shown that late-type stars are larger and cooler than predicted by models, possibly due to stellar magnetic activity. In this study, we revisit this problem by considering the latest advancements. We present an updated list of 32 eclipsing binary or multiple systems, with accurate measurements of mass and radius for at least one star. Comparisons with theoretical models reveal a discrepancy of about 7% and -4% for the radius and effective temperature, respectively. Stellar activity is further supported by comparing systems with similar components. Further studies on eclipsing binaries with precise measurements of mass, radius, and estimated activity levels, as well as the inclusion of magnetic activity in theoretical models, will enhance our understanding of low-mass stars, which are critical for exoplanet surveys.
