PSR J0210+5845: Ultra-wide binary pulsar with a B6 V main sequence star companion
Astronomy & Astrophysics (A&A)
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2d ago
Vol. 682 7. Stellar structure and evolution PSR J0210+5845: Ultra-wide binary pulsar with a B6 V main sequence star companion by E. van der Wateren, C. G. Bassa, G. H. Janssen, I. V. Yanes-Rizo, J. Casares, G. Nelemans, W. B. Stappers, C. M. Tan 2024, A&A, 682, A178 A neutron star forms in the explosion of a massive star as a supernova. When the exploding star is part of a binary system, the binary usually gets disrupted. In favorable conditions (e.g., asymmetries in the supernova explosion), however, the binary system can survive, leaving a newborn neutron star orbiting a massive compani ..read more
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The UMIST database for astrochemistry 2022
Astronomy & Astrophysics (A&A)
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1w ago
Vol. 682 12. Atomic, molecular, and nuclear data The UMIST database for astrochemistry 2022 by T. J. Millar, C. Walsh, M. Van de Sande, A. J. Markwick 2024, A&A, 682, A109 Detailed astrochemical models are necessary for interpreting the observations of interstellar and circumstellar molecules. They depend on the values of the rate coefficients of individual chemical reactions, and these need to be continuously updated to reflect advances in experimental and theoretical estimates. In this volume, Tom Millar and collaborators present the sixth release of the UMIST Database for Astrochemistr ..read more
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Secular change in the spin states of asteroids due to radiation and gravitation torques. New detections and updates of the YORP effect
Astronomy & Astrophysics (A&A)
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1w ago
Vol. 682 10. Planets and planetary systems Secular change in the spin states of asteroids due to radiation and gravitation torques. New detections and updates of the YORP effect by J. Durech, D. Vokrouhlicky, P. Pravec, et al. 2024, A&A, 682, A93 The motion of near-Earth asteroids is significantly influenced by non-gravitational forces, specifically thermal torques resulting from the proximity to the Sun. These effects are known as the Yarkovsky effect for orbital dynamics and the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect when impacting the object's rotation. The latter effect i ..read more
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A MeerKAT view of the double pulsar eclipses. Geodetic precession of pulsar B and system geometry
Astronomy & Astrophysics (A&A)
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3w ago
Vol. 681 2. Astrophysical processes A MeerKAT view of the double pulsar eclipses. Geodetic precession of pulsar B and system geometry by M.E. Lower, M. Kramer, R.M. Shannon, R.P. Breton, N. Wex, et al. 2024, A&A, 681, A26 PSR J0737−3039A/B is a unique double neutron star binary system in which both neutron stars are detected as radio pulsars. In addition, the system is viewed almost edge on (90.5 deg), allowing us to study the interaction of a radio signal with the neutron star magnetosphere. A variety of general relativity tests could be carried out on this system. In this paper, Lower a ..read more
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A comparative study of two X2.2 and X9.3 solar flares observed with HARPS-N. Reconciling Sun-as-a-star spectroscopy and high-spatial resolution solar observations in the context of the solar-stellar connection
Astronomy & Astrophysics (A&A)
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3w ago
Vol. 682 9. The Sun and the Heliosphere A comparative study of two X2.2 and X9.3 solar flares observed with HARPS-N. Reconciling Sun-as-a-star spectroscopy and high-spatial resolution solar observations in the context of the solar-stellar connection by A.G.M. Pietrow, M. Cretignier, M.K. Druett, et al. 2024, A&A, 682, A46 By virtue of its proximity, the Sun has always been observed and treated differently than the more distant exemplars. However, with advances in detectors and spectrographs, it has become increasingly more feasible to obtain a similar level of information for more remote ..read more
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S 308 and other X-ray emitting bubbles around Wolf-Rayet stars
Astronomy & Astrophysics (A&A)
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3w ago
Vol. 681 6. Interstellar and circumstellar matter S 308 and other X-ray emitting bubbles around Wolf-Rayet stars by Francesco Camilloni, Werner Becker, and Manami Sasaki 2024, A&A, 681, A122 The role of massive stars in shaping their local environment is a continuing theme in the study of galactic star formation. Including stellar feedback in galactic models through the combined effects of wind mass loss and photoionization is physically challenging and, still, hypothetical, or at best loosely based on phenomenological prescriptions. Supernovae also bespeak the need of understanding the ..read more
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ACT-DR5 Sunyaev-Zel’dovich clusters: Weak lensing mass calibration with KiDS
Astronomy & Astrophysics (A&A)
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1M ago
Vol. 681 3. Cosmology (including clusters of galaxies) ACT-DR5 Sunyaev-Zel’dovich clusters: Weak lensing mass calibration with KiDS by N. C. Robertson, C. Sifon, M. Asgari et al. 2024, A&A, 681, A87 Galaxy clusters trace the large-scale matter distribution in the Universe. It is fundamental to know precisely their number density, masses, baryon content, and evolution with redshift, to reveal the growth of structure and constrain the amplitude of matter fluctuations, the matter density, and the dark energy equation of state. They are important diagnostics of any cosmological model, and ca ..read more
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An almost dark galaxy with the mass of the Small Magellanic Cloud
Astronomy & Astrophysics (A&A)
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1M ago
Vol. 680 4. Extragalactic astronomy An almost dark galaxy with the mass of the Small Magellanic Cloud by M. Montes, I. Trujillo, A. Karunakaran, R. Infante-Sainz, K. Spekkens, G. Golini, M. Beasley, M. Cebrián, N. Chamba, M. D'Onofrio, L. Kelvin, J. Román 2023, A&A, 680, A15 Some low surface brightness galaxies are so weak that they elude detection in the Sloan Digital Sky Survey. These “almost dark galaxies” have a red surface brightness at the center of more than 26 mag/arcsec2, corresponding to a stellar surface density of less than a few solar masses per pc^2. This small amount of st ..read more
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Analysis of the first coronagraphic multi-band observations of a sungrazing comet
Astronomy & Astrophysics (A&A)
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2M ago
Vol. 680 9. The Sun and the Heliosphere Analysis of the first coronagraphic multi-band observations of a sungrazing comet by AUTHORS 2023, A&A, 680, A90 The continuous monitoring of the solar corona with space-based visible light (VL) coronagraphs over the last decades has led to the discovery of a multitude of small comets (with nuclei of a few tens of meters) with perihelia usually smaller than 2 solar radii. The origin of these comets called 'sungrazers' is not yet fully understood, but many originate from the breakup of a larger comet that passed just above the solar surface. Now for ..read more
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Water condensation zones around main sequence stars
Astronomy & Astrophysics (A&A)
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3M ago
Vol. 679 10. Planets and planetary systems Water condensation zones around main sequence stars by M. Turbet, T. J. Fauchez, J. Leconte, E. Bolmont, G. Chaverot, F. Forget, E. Millour, F. Selsis, B. Charnay, E. Ducrot, M. Gillon, A. Maurel, and G. L. Villanueva 2023, A&A, 679, A126 As a primary prerequisite for the development of life, the conditions that allow rocky planets to have liquid water on their surface are of extreme interest. Numerical climate investigations into this topic have concentrated on the conditions needed to maintain existing water bodies but have seldom addressed tho ..read more
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