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)

FEATURED IMAGE All

Diffuse Galactic cirrus across dust tracers (Liu, Q., et al., 2025, A&A, 704, A269)

Astronomy & Astrophysics is published under Subscribe to Open (S2O). S2O is a subscription open access model that relies on library contributions to make content open access for the benefit of the research community. The open access status of the journal is reviewed every year. A&A remains Open Access in 2025 under the Subscribe to Open (S2O) model.
More information is available here. To discuss or join the program, please contact us.

S2O FAQs

Latest special issuesAll

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

Open Access

Fermi-LAT detections of the classical novae V1723 Sco and V6598 Sgr in a multi-wavelength context

P. Fauverge, P. Jean, K. Sokolovsky, C. C. Cheung, M. Lemoine-Goumard, M.-H. Grondin, L. Chomiuk, A. Dickenson, J. D. Linford, K. Mukai and J. L. Sokoloski

A&A, 705 (2026) A19

Published online: 24 December 2025
Open Access

The topology of Rayleigh-Levy flights in two dimensions

Reginald Christian Bernardo, Stephen Appleby, Francis Bernardeau and Christophe Pichon

A&A, 705 (2026) A18

Published online: 24 December 2025
Open Access

TDCOSMO - XXI. Accurate stellar velocity dispersions of the SL2S lens sample and the fundamental plane of the lensing mass

Pritom Mozumdar, Shawn Knabel, Tommaso Treu, Alessandro Sonnenfeld, Anowar J. Shajib, Michele Cappellari and Carlo Nipoti

A&A, 705 (2026) A13

Published online: 24 December 2025
Open Access

Detecting metal enrichment of the intergalactic medium with the two-point correlation function of the flux - Application to the UVES deep spectrum

S. Di Stefano, V. D’Odorico, G. Cupani, D. Milaković, A. Trost, S. Cristiani, M. Viel and R. F. Carswell

A&A, 705 (2026) A16

Published online: 24 December 2025
Open Access

The halo magnetic field of a spiral galaxy at z = 0.414

Timea Orsolya Kovacs, Sui Ann Mao, Aritra Basu, Yik Ki Ma and Bryan M. Gaensler

A&A, 705 (2026) A28

Published online: 24 December 2025
Open Access

Structural evolution of quiescent galaxies at intermediate redshifts at UV and red rest-frame wavelengths

Michele Pizzardo, Ivana Damjanov, Jubee Sohn and Margaret J. Geller

A&A, 705 (2026) A30

Published online: 24 December 2025
Open Access

Asymmetries in stellar streams induced by a galactic merger

Claire Guillaume, Florent Renaud, Nicolas F. Martin, Benoit Famaey, Paola Di Matteo, Guillaume F. Thomas, Salvatore Ferrone, Rodrigo Ibata and Giulia Pagnini

A&A, 705 (2026) A6

Published online: 24 December 2025
Open Access

Constraining lens masses in moderately to highly magnified microlensing events from Gaia

U. Pylypenko, Ł. Wyrzykowski, P. J. Mikołajczyk, K. Kotysz, P. Zieliński, N. Ihanec, M. Wicker, M. Ratajczak, M. Sitek, K. Howil et al. (50 more)

A&A, 705 (2026) A24

Published online: 24 December 2025

Most downloaded articles

3658	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
2290	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
1831	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
1397	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
1166	Open Access Interpreting deep learning-based stellar mass estimation via causal analysis and mutual information decomposition Wei Zhang, Qiufan Lin, Yuan-Sen Ting, Shupei Chen, Hengxin Ruan, Song Li and Yifan Wang A&A, 703 (2025) A276 Published online: 26 November 2025

Volume 705 (January 2026) (in progress)
See the table of contents
Volume 704 (December 2025) (in progress)
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

12827	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
9349	Free Access A search for prompt γ-ray counterparts to fast radio bursts in the Insight-HXMT data C. Guidorzi, M. Marongiu, R. Martone, L. Nicastro, S. L. Xiong, J. Y. Liao, G. Li, S. N. Zhang, L. Amati, F. Frontera et al. (114 more) A&A, 637 (2020) A69 Published online: 15 May 2020
6777	Free Access Constraining the transient high-energy activity of FRB 180916.J0158+65 with Insight–HXMT follow-up observations C. Guidorzi, M. Orlandini, F. Frontera, L. Nicastro, S. L. Xiong, J. Y. Liao, G. Li, S. N. Zhang, L. Amati, E. Virgilli et al. (89 more) A&A, 642 (2020) A160 Published online: 15 October 2020
6553	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
5573	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

22064	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
15774	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
15327	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
14794	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
13610	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

Fermi-LAT detections of the classical novae V1723 Sco and V6598 Sgr in a multi-wavelength context

The topology of Rayleigh-Levy flights in two dimensions

TDCOSMO - XXI. Accurate stellar velocity dispersions of the SL2S lens sample and the fundamental plane of the lensing mass

Detecting metal enrichment of the intergalactic medium with the two-point correlation function of the flux - Application to the UVES deep spectrum

The halo magnetic field of a spiral galaxy at z = 0.414

Structural evolution of quiescent galaxies at intermediate redshifts at UV and red rest-frame wavelengths

Asymmetries in stellar streams induced by a galactic merger

Constraining lens masses in moderately to highly magnified microlensing events from Gaia

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

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

Interpreting deep learning-based stellar mass estimation via causal analysis and mutual information decomposition

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

A search for prompt γ-ray counterparts to fast radio bursts in the Insight-HXMT data

Constraining the transient high-energy activity of FRB 180916.J0158+65 with Insight–HXMT follow-up observations

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

Planck 2018 results - VI. Cosmological parameters

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

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

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) (in progress)

Volume 703 (November 2025)

News