Astronomy & Astrophysics (A&A)

[56792]JWST-TST High Contrast: Medium-resolution spectroscopy reveals a carbon-rich circumplanetary disk around the young accreting exoplanet Delorme 1AB b

The large-scale kinematics of young stars in the Milky Way disc: First results from SDSS-V

Stretch to stretch, dust to dust: Lower-value local H_0 measurements from the two-population modelling of type Ia supernovae

Experimental confirmation of barrierless reactions between HeH^+ and deuterium atoms suggests a lower abundance of the first molecules at very high redshifts

Volume 705 (January 2026)
(in progress)

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A microquasar shuts down, forming a remnant (Abaroa, L., et al., 2026, A&A, 705, L4)

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Euclid Quick Data Release (Q1) (in progress)
Solar Orbiter First Results (Nominal Mission Phase) (in progress)
ZTF SN Ia DR2

Open Access

Missing dust of super-early galaxies - Supernova blowout and gas–dust venting in blue monsters

Sergio Martínez-González, Santiago Jiménez and Casiana Muñoz-Tuñón

A&A, 705 (2026) L10

Published online: 12 January 2026
Open Access

First reverberation mapping of a Bowen fluorescence line

Martin W. Ochmann, Edward M. Cackett, Lukas Diehl, Keith Horne, Malte A. Probst and Wolfram Kollatschny

A&A, 705 (2026) L11

Published online: 12 January 2026
Open Access

A pristine, star-forming complex at z = 4.19

E. Vanzella, M. Messa, A. Zanella, A. Bolamperti, M. Castellano, F. Loiacono, P. Bergamini, G. Roberts Borsani, A. Adamo, A. Fontana et al. (7 more)

A&A, 705 (2026) L12

Published online: 12 January 2026
Open Access

Polarization echoes from past nuclear activity in the quasi-periodic eruption source GSN 069

B. Agís-González, D. Hutsemékers, I. Liodakis, S. Cazzoli, D. Sluse, G. Miniutti, I. Márquez, J. Masegosa, F. Marin, J. A. Acosta-Pulido and C. Ramos Almeida

A&A, 705 (2026) L13

Published online: 12 January 2026
Open Access

The near-infrared silhouette of the Flying Saucer edge-on disc revealed by the JWST JEDIce program

Emmanuel Dartois, Jennifer A. Noble, Jennifer B. Bergner, Klaus M. Pontoppidan, Korash Assani, Daniel Harsono, Melissa K. McClure, Julia C. Santos, Will E. Thompson, Lukas Welzel et al. (10 more)

A&A, 705 (2026) L14

Published online: 12 January 2026
Open Access

The interpretation of XRISM X-ray measurements of turbulence in the intracluster medium: A comparison with cosmological simulations

F. Vazza and G. Brunetti

A&A, 705 (2026) A129

Published online: 12 January 2026
Open Access

Constraints on the z ∼ 6−13 intergalactic medium from JWST spectroscopy of Lyman-alpha damping wings in galaxies

Charlotte A. Mason, Zuyi Chen, Daniel P. Stark, Ting Yi Lu, Michael Topping and Mengtao Tang

A&A, 705 (2026) A114

Published online: 12 January 2026
Open Access

MINDS - Young binary systems with JWST/MIRI: Variable water-rich primaries and extended emission

Nicolás T. Kurtovic, Sierra L. Grant, Milou Temmink, Andrew D. Sellek, Ewine F. van Dishoeck, Thomas Henning, Inga Kamp, Valentin Christiaens, Andrea Banzatti, Danny Gasman et al. (9 more)

A&A, 705 (2026) A97

Published online: 12 January 2026

Most downloaded articles

3963	Free Access The chemistry of C₂ and C₃ in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distances r_h ≥ 2.9 AU J. Helbert, H. Rauer, D. C. Boice and W. F. Huebner A&A, 442 3 (2005) 1107-1120 Published online: 14 October 2005
3394	Free Access A long term spectroscopic and photometric study of the old nova HR Delphini M. Friedjung, M. Dennefeld and I. Voloshina A&A, 521 (2010) A84 Published online: 25 October 2010
1066	Free Access Spectroscopic observations of Hα emission-line stars from Sanduleak & Stephenson's 1973 (SS73) list C. B. Pereira, C. S. Franco and F. X. de Araújo A&A, 397 3 (2003) 927-942 Published online: 21 January 2003
1013	Open Access Assessing interstellar comet 3I/ATLAS with the 10.4 m Gran Telescopio Canarias and the Two-meter Twin Telescope R. de la Fuente Marcos, M. R. Alarcon, J. Licandro, M. Serra-Ricart, J. de León, C. de la Fuente Marcos, G. Lombardi, A. Tejero, A. Cabrera-Lavers, S. Guerra Arencibia and I. Ruiz Cejudo A&A, 700 (2025) L9 Published online: 05 August 2025
993	Planck 2018 results Free Access Planck 2018 results - VI. Cosmological parameters Planck Collaboration, N. Aghanim, Y. Akrami, M. Ashdown, J. Aumont, C. Baccigalupi, M. Ballardini, A. J. Banday, R. B. Barreiro, N. Bartolo et al. (172 more) A&A, 641 (2020) A6 Published online: 11 September 2020

Volume 705 (January 2026) (in progress)
1. A microquasar shuts down, forming a remnant (Abaroa, L., et al., 2026, A&A, 705, L4)
See the table of contents
Volume 704 (December 2025)
1. Diffuse X-rays near PeVatron 1LHAASO J1740+0948u (Brunelli, G., et al., 2025, A&A, 704, A30)
2. The 8 lensed quasars used for measuring H₀ (TDCOSMO Collaboration, 2025, A&A, 704, A63)
3. JWST-MIRI Spectra of the Delorme 1 system (Mâlin, M., 2025, A&A, 704, A181)
4. Filamentary structure in the Galactic CO emission (Soler, J. D., et al., 2025, A&A, 704, A164)
5. Simulation of a major merger of two dwarf galaxies (Deng, Y., et al., 2025, A&A, 704, A240)
6. M87 ring and magnetic field evolution (2017–2021) (The Event Horizon Telescope Collaboration, 2025, A&A, 704, A91)
7. JWST traces dust evolution at Horsehead's edge (Elyajouri, M., et al., 2025, A&A, 704, A203)
8. Diffuse Galactic cirrus across dust tracers (Liu, Q., et al., 2025, A&A, 704, A269)
See the table of contents
Volume 703 (November 2025)
1. Simulation of a supernova remnant in Cygnus OB2 (Härer, L., et al., 2025, A&A, 703, A111)
2. HST+JWST color image of the cluster lens A370 (Diego, J. M., et al., 2025, A&A, 703, A207)
See the table of contents

14249	Free Access A long term spectroscopic and photometric study of the old nova HR Delphini M. Friedjung, M. Dennefeld and I. Voloshina A&A, 521 (2010) A84 Published online: 25 October 2010
6712	Free Access The chemistry of C₂ and C₃ in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distances r_h ≥ 2.9 AU J. Helbert, H. Rauer, D. C. Boice and W. F. Huebner A&A, 442 3 (2005) 1107-1120 Published online: 14 October 2005
5545	Open Access JWST reveals a supernova following a gamma-ray burst at z ≃ 7.3 A. J. Levan, B. Schneider, E. Le Floc’h, G. Brammer, N. R. Tanvir, D. B. Malesani, A. Martin-Carrillo, A. Rossi, A. Saccardi, A. Sneppen et al. (43 more) A&A, 704 (2025) L8 Published online: 09 December 2025
5536	Open Access Assessing interstellar comet 3I/ATLAS with the 10.4 m Gran Telescopio Canarias and the Two-meter Twin Telescope R. de la Fuente Marcos, M. R. Alarcon, J. Licandro, M. Serra-Ricart, J. de León, C. de la Fuente Marcos, G. Lombardi, A. Tejero, A. Cabrera-Lavers, S. Guerra Arencibia and I. Ruiz Cejudo A&A, 700 (2025) L9 Published online: 05 August 2025
5210	Open Access A grand-design spiral galaxy 1.5 billion years after the Big Bang with JWST Rashi Jain and Yogesh Wadadekar A&A, 703 (2025) A96 Published online: 10 November 2025

20686	Free Access SDSS-based taxonomic classification and orbital distribution of main belt asteroids J. M. Carvano, P. H. Hasselmann, D. Lazzaro and T. Mothé-Diniz A&A, 510 (2010) A43 Published online: 05 February 2010
18838	Free Access A long term spectroscopic and photometric study of the old nova HR Delphini M. Friedjung, M. Dennefeld and I. Voloshina A&A, 521 (2010) A84 Published online: 25 October 2010
15487	Open Access Assessing interstellar comet 3I/ATLAS with the 10.4 m Gran Telescopio Canarias and the Two-meter Twin Telescope R. de la Fuente Marcos, M. R. Alarcon, J. Licandro, M. Serra-Ricart, J. de León, C. de la Fuente Marcos, G. Lombardi, A. Tejero, A. Cabrera-Lavers, S. Guerra Arencibia and I. Ruiz Cejudo A&A, 700 (2025) L9 Published online: 05 August 2025
15278	Planck 2018 results Free Access Planck 2018 results - VI. Cosmological parameters Planck Collaboration, N. Aghanim, Y. Akrami, M. Ashdown, J. Aumont, C. Baccigalupi, M. Ballardini, A. J. Banday, R. B. Barreiro, N. Bartolo et al. (172 more) A&A, 641 (2020) A6 Published online: 11 September 2020
13001	Open Access Temporal evolution of the third interstellar comet 3I/ATLAS: Spin, color, spectra, and dust activity T. Santana-Ros, O. Ivanova, S. Mykhailova, N. Erasmus, K. Kamiński, D. Oszkiewicz, T. Kwiatkowski, M. Husárik, T. S. Ngwane and A. Penttilä A&A, 702 (2025) L3 Published online: 26 September 2025

Astronomy & Astrophysics

Latest highlightsAll

Latest volumeAll

SUBSCRIBE TO OPEN (S2O)

FEATURED IMAGE All

Latest special issuesAll

Missing dust of super-early galaxies - Supernova blowout and gas–dust venting in blue monsters

First reverberation mapping of a Bowen fluorescence line

A pristine, star-forming complex at z = 4.19

Polarization echoes from past nuclear activity in the quasi-periodic eruption source GSN 069

The near-infrared silhouette of the Flying Saucer edge-on disc revealed by the JWST JEDIce program

The interpretation of XRISM X-ray measurements of turbulence in the intracluster medium: A comparison with cosmological simulations

Constraints on the z ∼ 6−13 intergalactic medium from JWST spectroscopy of Lyman-alpha damping wings in galaxies

MINDS - Young binary systems with JWST/MIRI: Variable water-rich primaries and extended emission

The chemistry of C₂ and C₃ in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distances r_h ≥ 2.9 AU

A long term spectroscopic and photometric study of the old nova HR Delphini

Spectroscopic observations of Hα emission-line stars from Sanduleak & Stephenson's 1973 (SS73) list

Assessing interstellar comet 3I/ATLAS with the 10.4 m Gran Telescopio Canarias and the Two-meter Twin Telescope

Planck 2018 results - VI. Cosmological parameters

A long term spectroscopic and photometric study of the old nova HR Delphini

The chemistry of C₂ and C₃ in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distances r_h ≥ 2.9 AU

JWST reveals a supernova following a gamma-ray burst at z ≃ 7.3

Assessing interstellar comet 3I/ATLAS with the 10.4 m Gran Telescopio Canarias and the Two-meter Twin Telescope

A grand-design spiral galaxy 1.5 billion years after the Big Bang with JWST

SDSS-based taxonomic classification and orbital distribution of main belt asteroids

A long term spectroscopic and photometric study of the old nova HR Delphini

Assessing interstellar comet 3I/ATLAS with the 10.4 m Gran Telescopio Canarias and the Two-meter Twin Telescope

Planck 2018 results - VI. Cosmological parameters

Temporal evolution of the third interstellar comet 3I/ATLAS: Spin, color, spectra, and dust activity

Volume 705 (January 2026) (in progress)

Volume 704 (December 2025)

Volume 703 (November 2025)

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