Lens Mass Estimate in the Galactic Disk Extreme Parallax Microlensing Event Gaia19dke

Maskoliunas, M.; Wyrzykowski, L.; Howil, K.; Mikolajczyk, P.J.; Zielinski, P.; Kaczmarek, Z.; Kruszyriska, K.; Jabloriska, M.; Zdanavicius, J.; Pakstiene, E.; Cepas, V.; Rybicki, K.A.; Janulis, R.; Stonkute, E.; Gromadzki, M.; Ihanec, N.; Adomaviciene, R.; Siskauskaite, K.; Bronikowski, M.; Sivak, P.; Stankeviciute, A.; Sitek, M.; Ratajczak, M.; Pylypenko, U.; Gezer, I.; Awiphan, S.; Bachelet, E.; Bakowska, K.; Boyle, R.P.; Bozza, V.; Brincat, S.M.; Burgaz, U.; Butterley, T.; Carrasco, J.M.; Cassan, A.; Cusano, F.; Damljanovic, G.; Davidson, J.W.; Dhillon, V.S.; Dominik, M.; Dubois, F.; Esenoglu, Hasan; Jaimes, R.; Fukui, A.; Galdies, C.; Garofalo, A.; Godunova, V.; Guver, Tolga; Hansdorfer, F.; Heidt, J.; Hundertmark, M.; Izviekova, I.; Joachimczyk, B.; Kaminska, M.K.; Kamiriski, K.; Kaptan, S.; Kvernadze, T.; Kvaratskhelia, O.; Kotysz, K.; Littlefair, S.; Michniewicz, O.; Nakhatutai, N.; Ogtoza, W.; Ohsawa, R.; Olszewska, J.M.; Poleski, R.; Poliriska, M.; Popowicz, A.; Qvam, J.K.T.; Radziwonowicz, M.; Reichart, D.E.; Slowikowska, A.; Simon, A.; Sonbas, E.; Stojanovic, M.; Szkudlarek, M.; Tsapras, Y.; Vanaverbeke, S.; Wambsganss, J.; Wilson, R.W.; Zola, S.

doi:10.32023/0001-5237/74.2.1

Lens Mass Estimate in the Galactic Disk Extreme Parallax Microlensing Event Gaia19dke

Atıf İçin Kopyala

Maskoliunas M., Wyrzykowski L., Howil K., Mikolajczyk P., Zielinski P., Kaczmarek Z., ...Daha Fazla

Acta Astronomica, cilt.74, sa.2, ss.77-111, 2024 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 74 Sayı: 2
Basım Tarihi: 2024
Doi Numarası: 10.32023/0001-5237/74.2.1
Dergi Adı: Acta Astronomica
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Sayfa Sayıları: ss.77-111
Anahtar Kelimeler: fundamental parameters - white dwarfs, Gravitational lensing, micro - Stars
İstanbul Üniversitesi Adresli: Evet

Özet

We present the results of our analysis of Gaia19dke, an extraordinary microlensing event in the Cygnus constellation that the Gaia satellite discovered. This event featured a strong microlensing parallax effect, resulting in multiple light curve peaks. We conducted extensive photometric, spectroscopic, and high-resolution imaging follow-up observations to determine the mass and nature of the invisible lensing object. Using the Milky Way priors on the density and proper motion of lenses, we found that the lens is likely to be located at a distance of DL = 3.3+2.1 −1.7 kpc, and has a mass of ML = 0.50+0.82 −0.27 M⊙ . Based on its low luminosity and mass, we propose that the lens in the Gaia19dke event is either a main sequence star or an isolated white dwarf. Due to its brightness, longevity, and lack of blending, Gaia19dke is a target for which the forthcoming Gaia Data Release 4 data will help to constrain the parameters of the lens.