LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
F om Rubin-LSST ime-se ies da a o s ella
p ope ies: he model i ing echnique
Ma cella Ma coni, Robe o Molina o, Giulia De Somma, Vincenzo Ripepi, Sil io
Leccia, Ila ia Musella, Te esa Sicignano (SSM, ESO) , E asmo T en in, Massimiliano
Ga o
INAF-Osse a o io As onomico di Capodimon e
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Ou line
● Recen ly de eloped heo e ical scena io o Classical Cepheids, RR
Ly ae and Type II Cepheids in he Rubin-LSST il e s → de i ed me al
dependen Pe iod-Luminosi y and Pe iod-Wesenhei ela ions.
● The model- i ing echnique o ep oduce mul i- il e ligh cu es and
pulsa ional eloci y a ia ions → a ecen ly published applica ion o
Gaia da a.
● The pe spec i es o applica ion o Rubin-LSST ime-se ies da a o
Cepheids and RR Ly ae and o he classes o pulsa ing s a s.
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Recen ly de eloped heo e ical scena io o
pulsa ing s a s in he Rubin-LSST il e s
Model p edic ions based on nonlinea con ec i e hyd ocodes allow us o de i e ligh
cu es in di e en pho ome ic bands and in u n mean magni udes and colo s ha ,
oge he wi h pe iods, a e he main ing edien s o build PL, PLC and PW ela ions.
We de i ed me al-dependen PL and PW ela ionships in he Rubin-LSST bands o RR
Ly ae, Classical and Type II Cepheids.
Ma coni, M., e al. 2022, ApJ, New Theo e ical Pe iod-Luminosi y-Me allici y Rela ions o RR Ly ae in he Rubin-LSST Fil e s,
934, 1, 29
De Somma, G. e al. 2024, MNRAS, Classical Cepheid pulsa ion p ope ies in he Rubin-LSST il e s, 528, 4, 6637
Ma coni, M., e al. 2025, A&A, New heo e ical p edic ions on T2Cs: owa ds a sel consis en Pop. II dis ance scale, in p ess
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Some examples o heo e ical ligh cu es
in he Rubin-LSST il e s
RR Ly ae Cepheids
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Some examples o heo e ical ligh cu es
in he Rubin-LSST il e s
Mean magni udes and colo s in he
Rubin-LSST il e s
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Some examples o heo e ical ligh cu es
in he Rubin-LSST il e s
Mean magni udes and colo s in he
Rubin-LSST il e s
Rubin-LSST PL and PW ela ions
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Recen ly de eloped heo e ical NIR PLZ o RR Ly ae
Ma coni e al. 2022 ApJ
Me allici y e ec
on he ze o-poin
i
z
y
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Recen ly de eloped heo e ical PW(Z) and CC(Z) o RRL
Ma coni e al. 2022 ApJ
u,g
u,
g,
g,i
i,z
g,y
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Recen ly de eloped heo e ical PW(Z) and CC(Z) o RRL
Ma coni e al. 2022 ApJ
u,g
u,
g,
g,
i,z
g,y
Minimum me allici y e ec !
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The model- i ing echnique o ep oduce mul i- il e ligh cu es
and pulsa ional eloci y a ia ions
A sample o 46 Classical Cepheids wi h p ecise pho ome ic and adial eloci y da a om
Gaia DR3 was analyzed and complemen a y spec oscopic me allici y measu emen s by
T en in e al. (2024)
Molina o e al. 2025, A&A
Se e al c i e ia we e conside ed:
● he wides possible co e age o he
expec ed pe iod ange o CCs;
●well-sampled ligh and adial eloci y
cu es in phase;
● su icien ly accu a e pa allaxes
(σϖ/ϖ < 50%);
● me allici ies ob ained h ough ecen
high- esolu ion spec oscopy
Molina o e al. 2025, A&A
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The model- i ing echnique o ep oduce mul i- il e ligh cu es
and pulsa ional eloci y a ia ions
Molina o e al. 2025, A&A
Model i ing was conduc ed by di ec ly compa ing p edic ed and obse ed a ia ions in Gaia G, GBP,
and GRP ligh cu es, as well as adial eloci y ime se ies, o he a ious me al abundances.
i) T ans o ma ion o he bolome ic magni ude ligh cu es o he models in he Gaia
pho ome ic sys em (G, GBP, GRP).
ii) Fi o he model ligh cu es (in absolu e magni ude) o obse a ions is achie ed
by a magni ude shi (δmag) and a small ine une o he phase (δϕ), such ha he
esiduals a ain he minimum alue.
Molina o e al. 2025, A&A
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The model- i ing echnique o ep oduce mul i- il e ligh cu es
and pulsa ional eloci y a ia ions
Molina o e al. 2025, A&A
Model i ing was conduc ed by di ec ly compa ing p edic ed and obse ed a ia ions in Gaia G, GBP,
and GRP ligh cu es, as well as adial eloci y ime se ies, o he a ious me al abundances.
i) T ans o ma ion o he bolome ic magni ude ligh cu es o he models in he Gaia
pho ome ic sys em (G, GBP, GRP).
ii) Fi o he model ligh cu es (in absolu e magni ude) o obse a ions is achie ed
by a magni ude shi (δmag) and a small ine une o he phase (δϕ), such ha he
esiduals a ain he minimum alue.
iii) Fi o he model pulsa ional eloci y o obse a ions, apa om a igid shi along
he eloci y axis (δVel) and a small ine une o he phase (δϕ), includes a s e ch
ac o (p- ac o ) o he heo e ical cu e, in o de o ma ch he obse ed
peak- o-peak ampli ude.
Molina o e al. 2025, A&A
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The model- i ing echnique o ep oduce mul i- il e ligh cu es
and pulsa ional eloci y a ia ions
Molina o e al. 2025, A&A
Model i ing was conduc ed by di ec ly compa ing p edic ed and obse ed a ia ions in Gaia G, GBP,
and GRP ligh cu es, as well as adial eloci y ime se ies, o he a ious me al abundances.
i) T ans o ma ion o he bolome ic magni ude ligh cu es o he models in he Gaia
pho ome ic sys em (G, GBP, GRP).
ii) Fi o he model ligh cu es (in absolu e magni ude) o obse a ions is achie ed
by a magni ude shi (δmag) and a small ine une o he phase (δϕ), such ha he
esiduals a ain he minimum alue.
iii) Fi o he model pulsa ional eloci y o obse a ions, apa om a igid shi along
he eloci y axis (δVel) and a small ine une o he phase (δϕ), includes a s e ch
ac o (p- ac o ) o he heo e ical cu e, in o de o ma ch he obse ed
peak- o-peak ampli ude.
i ) Boo s ap simula ions a e used o epea s eps ii) and iii) many imes
Molina o e al. 2025, A&A
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Some examples o bes i models
Molina o e al. 2025, A&A
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Some examples o bes i models
Molina o e al. 2025, A&A
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Some examples o bes i models
Molina o e al. 2025, A&A
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Some examples o bes i models
Molina o e al. 2025, A&A
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Some examples o bes i models
Molina o e al. 2025, A&A
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Some examples o bes i models
Molina o e al. 2025, A&A
Masses, luminosi ies, e ec i e empe a u es, mean magni udes
and colo s, dis ances (!)
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Model i ing o Rubin-LSST mul i- il e ligh cu es: an example o ou
e y p elimina y esul s o he RRL Gaia DR3 4831519899384690944
Rubin-LSST da a
i ed wi h nonlinea
pulsa ion models.
Ve y p elimina y es ima e o
M, L, Te, Z and indi idual
dis ance modulus.
In e ed pa allax (0.04 mas) in
ag eemen wi h Gaia bu la ge
Gaia e o .
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Model i ing o Rubin-LSST mul i- il e ligh cu es
Also in connec ion wi h in-kind con ibu ion S8 (see Musella’s alk), we plan o
de elop an ad anced in e ac i e model da ase based on he compu a ion o
nonlinea con ec i e pulsa ion models
These models will be p oduced using bo h S ellingwe and MESA RSP (see Deka’s
alk) codes
→ he i s ex ended da abase o pulsa ion models a ailable o he communi y
So wa e ools, Mon e-Ca lo and/o mul i-dimensional in e pola ion echniques, will be
de eloped o ma ch obse ed a ia ions o huge numbe s o Rubin-LSST pulsa o s,
wi h a e ined model i ing echnique → luminosi ies, empe a u es, masses,
chemical abundances and dis ances o all he in es iga ed s a s om
mul i- il e ligh (and adial eloci y) cu es.
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Conclusions
● A new heo e ical scena io in he Rubin-LSST il e s has been de eloped o a ious
classes o pulsa ing s a s on he basis o nonlinea con ec i e pulsa ion models.
● These models allow a success ul model- i ing o ligh and adial eloci y cu es (see
Gaia’s case)
● In his con ex , while wai ing o Rubin-LSST mul i- il e ligh cu es and in
connec ion wi h he in-kind con ibu ion S8, we a e de eloping an ad anced e sion
o he model- i ing echnique, able o ma ch obse ed a ia ions o huge numbe s
o Rubin-LSST pulsa o s.
