ALMA Cycle 10 Call for Proposals

The Atacama Large Millimeter/submillimeter Array (ALMA) director, on behalf of the Joint ALMA Observatory and the partner organizations in East Asia, Europe, and North America, is pleased to announce the ALMA Cycle 10 Call for Proposals for scientific observations is open.

ALMA Cycle 10 is currently scheduled for observations from October 2023 to September 2024. Users of any nationality or affiliation are invited to submit proposals before the deadline of 15:00 UTC on Wednesday, 10 May 2023.

On the 12-m Array, antenna configurations C-1 to C-8 (with maximum baselines between 0.16 and 8.5 km) will be offered. It is anticipated that 4300 hours will be allocated on the 12-m Array and 4300 hours on the Atacama Compact Array (ACA), also known as the Morita Array. Projects with observations in the highest-frequency Bands 8, 9, and 10 are strongly encouraged. Proposers are also encouraged to submit ACA stand-alone projects, especially in the LST range of 20h to 10h.

New in Cycle 10:

• Band 1 on the 12-m Array. Observations will be available for Stokes I only (no Stokes Q/U/V) and are anticipated to be available from March 2024. Band 1 will not be available in configurations C-7 and C-8;
• Spectral scans that include Total Power observations;
• 4x4-bit spectral modes for improved sensitivity on the 12-m Array (dual polarization);
• Solar observations in full polarization in Band 3 using only the 12-m Array;
• Phased array mode in Bands 1, 3, 6 and 7. The total time available for this mode will be limited to 50 hours;
• VLBI in Bands 1, 3, 6 and 7, including flexible tuning;
• Band-to-band phase calibration will be available for high-frequency observations on both the 7-m Array and all 12-m Array configurations. The total time available for projects needing band-to-band phase calibration will be limited;
• Joint Proposals with the Space Telescope Science Institute’s JWST, the National Radio Astronomy Observatory’s Karl G. Jansky Very Large Array, and the European Southern Observatory’s Very Large Telescope.

For more information about the Call, to download the ALMA Observing Tool, and to access all the Cycle 10 documentation, visit the ALMA Science Portal.

We strongly encourage proposers to review the new ALMA documentation for this Cycle available on the Science Portal, including the Cycle 10 Proposer’s Guide, the ALMA Primer, and the ALMA Users’ Policies. Proposers should also review their user accounts on the Science Portal to ensure that affiliations and email addresses are up to date, as well as expertise keywords and conflicts of interest for participating in the distributed peer review process.