Exploring chemical patterns in stellar populations with J-spectra

• Grant number: 21/08813-7
• Support Opportunities: Scholarships abroad - Research
• Start date: July 18, 2022
• End date: July 17, 2023
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
• Principal Investigator: Paula Rodrigues Teixeira Coelho
• Grantee: Paula Rodrigues Teixeira Coelho
• Host Investigator: Andrés Javier Cenarro Lagunas
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: Centro de Estudios de Física del Cosmos de Aragón (CEFCA), Spain

Abstract

Chemical abundances are used in galactic archeology techniques to infer the formation and evolution of the components in our Galaxy, stellar populations and galaxies in general. So far, chemical archeology studies have largely required the use of spectral data. Yet, the novel photometric survey J-PAS, with its system of 54 narrow-band filters, will effectively provide low resolution spectra for millions of stars and galaxies in the years to come. The current project aims at expanding chemical analysis of stellar populations beyond the study of spectra, by making use of the spectral energy distribution observed by J-PAS, the J-spectra. Tailored stellar population models will be required, varying the chemical abundances of interest, Mg, C, N, Ca and He. Stellar spectra will be modelled with different abundance patterns and synthesised into integrated light to represent simple stellar populations. Synthetic photometry will be performed to transform the new models into the J-PAS magnitudes. Studies will be performed to identify the colours (and combination of colours) which maximise the signal of each of the studied abundances. The models will be compared with already existing data to assess the ability in reproducing the loci of stars and galaxies in different colour-colour spaces. When suitable combinations of models and colours are achieved, a first application in search of the signal of multiple populations in extragalactic globular clusters will be performed. We expect this project to have a long-lasting legacy, as it provides a first framework for chemical archeological studies with J-PAS data.

Scientific publications

(12)

(The scientific publications listed on this page originate from the Web of Science or SciELO databases. Their authors have cited FAPESP grant or fellowship project numbers awarded to Principal Investigators or Fellowship Recipients, whether or not they are among the authors. This information is collected automatically and retrieved directly from those bibliometric databases.)

ASA'D, RANDA; COELHO, PAULA R. T.; JOHN, JOHINA M.; CHILINGARIAN, IGOR V.; BRUZUAL, GUSTAVO; CHARLOT, STEPHANE. Semiempirical versus Theoretical Stellar Population Models: A Comparison with Star Clusters. ASTRONOMICAL JOURNAL, v. 170, n. 2, p. 11-pg., 2025-08-04. (21/08813-7)

BRANCO, VINICIUS; COELHO, PAULA R. T.; LANCON, ARIANE; MARTINS, LUCIMARA P.; PRUGNIEL, PHILIPPE. Synthetic stellar spectra for studying multiple populations in globular clusters Extended grid, and the effects on the integrated light. Astronomy & Astrophysics, v. 687, p. 13-pg., 2024-07-05. (22/03703-1, 21/08813-7)

HUANG, YANG; BEERS, TIMOTHY C.; XIAO, KAI; YUAN, HAIBO; LEE, YOUNG SUN; GU, HONGRUI; HONG, JIHYE; LIU, JIFENG; FAN, ZHOU; COELHO, PAULA; et al. J-PLUS: Beyond Spectroscopy. III. Stellar Parameters and Elemental-abundance Ratios for Five Million Stars from DR3. ASTROPHYSICAL JOURNAL, v. 974, n. 2, p. 26-pg., 2024-10-01. (11/51680-6, 21/08813-7)

COSTA, G.; DUMONT, T.; LANCON, A.; PALACIOS, A.; CHARBONNEL, C.; PRUGNIEL, P.; EKSTROM, S.; GEORGY, C.; BRANCO, V.; COELHO, P.; et al. He-enriched STAREVOL models for globular cluster multiple populations: Self-consistent isochrones from ZAMS to the TP-AGB phase. Astronomy & Astrophysics, v. 690, p. 15-pg., 2024-10-01. (21/08813-7, 22/03703-1)

HERNAN-CABALLERO, A.; AKHLAGHI, M.; LOPEZ-SANJUAN, C.; RAMIO, H. VAZQUEZ; LAUR, J.; VARELA, J.; CIVERA, T.; MUNIESA, D.; FINOGUENOV, A.; FERNANDEZ-ONTIVEROS, J. A.; et al. The miniJPAS survey: Maximising the photo-z accuracy from multi-survey datasets with probability conflation. Astronomy & Astrophysics, v. 684, p. 14-pg., 2024-04-04. (21/08813-7)

LOPEZ, I. E.; BRUSA, M.; BONOLI, S.; SHANKAR, F.; ACHARYA, N.; LALOUX, B.; DOLAG, K.; GEORGAKAKIS, A.; LAPI, A.; ALMEIDA, C. RAMOS; et al. The miniJPAS survey: AGN and host galaxy coevolution of X-ray-selected sources. Astronomy & Astrophysics, v. 672, p. 20-pg., 2023-04-12. (21/08813-7, 11/51680-6)

DE SA-FREITAS, CAMILA; GADOTTI, DIMITRI A.; FRAGKOUDI, FRANCESCA; COELHO, PAULA; DE LORENZO-CACERES, ADRIANA; FALCON-BARROSO, JESUS; SANCHEZ-BLAZQUEZ, PATRICIA; KIM, TAEHYUN; MENDEZ-ABREU, JAIRO; NEUMANN, JUSTUS; et al. Bar ages derived for the first time in nearby galaxies Insights into secular evolution from the TIMER sample. Astronomy & Astrophysics, v. 698, p. 18-pg., 2025-05-28. (21/08813-7)

HERPICH, F. R.; ALMEIDA-FERNANDES, F.; SCHWARZ, G. B. OLIVEIRA; LIMA, E. V. R.; NAKAZONO, L.; ALONSO-GARCIA, J.; FONSECA-FARIA, M. A.; SARTORI, M. J.; BOLUTAVICIUS, G. F.; DE SOUZA, G. FABIANO; et al. The Fourth S-PLUS Data Release: 12-filter photometry covering ∼3000 square degrees in the southern hemisphere. Astronomy & Astrophysics, v. 689, p. 25-pg., 2024-09-20. (23/10774-5, 24/03575-9, 18/20977-2, 21/10429-0, 21/11345-5, 22/00996-8, 21/09468-1, 22/11645-1, 23/14272-4, 18/21661-9, 20/00457-4, 19/01312-2, 21/12744-0, 21/08813-7)

DE SA-FREITAS, CAMILA; GADOTTI, DIMITRI A.; FRAGKOUDI, FRANCESCA; COCCATO, LODOVICO; COELHO, PAULA; DE LORENZO-CACERES, ADRIANA; FALCON-BARROSO, JESUS; KOLCU, TUTKU; MARTIN-NAVARRO, IGNACIO; MENDEZ-ABREU, JAIRO; et al. Disc galaxies are still settling Discovery of the smallest nuclear discs and their young stellar bars. Astronomy & Astrophysics, v. 678, p. 12-pg., 2023-10-24. (21/08813-7)

LOPEZ-SANJUAN, C.; RAMIO, H. VAZQUEZ; XIAO, K.; YUAN, H.; CARRASCO, J. M.; VARELA, J.; CRISTOBAL-HORNILLOS, D.; TREMBLAY, P. -E.; EDEROCLITE, A.; MARIN-FRANCH, A.; et al. J-PLUS: Toward a homogeneous photometric calibration using Gaia BP/RP low-resolution spectra. Astronomy & Astrophysics, v. 683, p. 20-pg., 2024-03-05. (21/08813-7)

DOMINGUEZ SANCHEZ, H.; COELHO, P.; BRUZUAL, G.; HERNAN-CABALLERO, A.; LOPEZ SANJUAN, C.; FERNANDEZ-ONTIVEROS, J. A.; DIAZ-GARCIA, L. A.; SUELVES, L.; ALVAREZ-CANDAL, A.; BREDA, I.; et al. J-PAS: A neural network approach to single stellar population characterisation. Astronomy & Astrophysics, v. 705, p. 16-pg., 2026-01-20. (21/08813-7)

PACHECO, THAYSE A.; COELHO, PAULA R. T.; MARTINS, LUCIMARA P.; SCHIAVON, RICARDO P.; DE LIMA, ERIK V. R.; DIAZ, MARCOS P.; NARDIELLO, DOMENICO; LEVENHAGEN, RONALDO S.; RIFFEL, ROGERIO; BONATTO, CHARLES J.; et al. Hidden Figures of Globular Clusters: Integrated Stellar Populations Impacted by Hot Subdwarfs. ASTROPHYSICAL JOURNAL, v. 992, n. 1, p. 15-pg., 2025-10-10. (24/15229-8, 22/03703-1, 21/08813-7)