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OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from <i>Spitzer</i> Only
Wang, Tianshu,Calchi Novati, S.,Udalski, A.,Gould, A.,Mao, Shude,Zang, W.,Beichman, C.,Bryden, G.,Carey, S.,Gaudi, B. S.,Henderson, C. B.,Shvartzvald, Y.,Yee, J. C.,Mró,z, P.,Poleski, R.,Skowron American Astronomical Society 2018 The Astrophysical journal Vol.860 No.1
<P>We analyze the binary gravitational microlensing event OGLE-2017-BLG-1130 (mass ratio q similar to 0.45), the first published case in which the binary anomaly was detected only by the Spitzer Space Telescope. This event provides strong evidence that some binary signals can be missed by observations from the ground alone but detected by Spitzer. We therefore invert the normal procedure, first finding the lens parameters by fitting the space-based data and then measuring the microlensing parallax using ground-based observations. We also show that the normal four-fold space-based degeneracy in the single-lens case can become a weak eight-fold degeneracy in binary-lens events. Although this degeneracy is resolved in event OGLE-2017-BLG-1130, it might persist in other events.</P>
Zhu, Wei,Udalski, A.,Novati, S. Calchi,Chung, S.-J.,Jung, Y. K.,Ryu, Y.-H.,Shin, I.-G.,Gould, A.,Lee, C.-U.,Albrow, M. D.,Yee, J. C.,Han, C.,Hwang, K.-H.,Cha, S.-M.,Kim, D.-J.,Kim, H.-W.,Kim, S.-L.,Ki American Institute of Physics 2017 The Astronomical journal Vol.154 No.5
<P>We analyze an ensemble of microlensing events from the 2015 Spitzer microlensing campaign, all of which were densely monitored by ground-based high-cadence survey teams. The simultaneous observations from Spitzer and the ground yield measurements of the microlensing parallax vector pi(E), from which compact constraints on the microlens properties are derived, including less than or similar to 25% uncertainties on the lens mass and distance. With the current sample, we demonstrate that the majority of microlenses are indeed in the mass range of M dwarfs. The planet sensitivities of all 41 events in the sample are calculated, from which we provide constraints on the planet distribution function. In particular, assuming a planet distribution function that is uniform in log q, where q is the planet-to-star mass ratio, we find a 95% upper limit on the fraction of stars that host typical microlensing planets of 49%, which is consistent with previous studies. Based on this planet-free sample, we develop the methodology to statistically study the Galactic distribution of planets using microlensing parallax measurements. Under the assumption that the planet distributions are the same in the bulge as in the disk, we predict that similar to 1/3 of all planet detections from the microlensing campaigns with Spitzer should be in the bulge. This prediction will be tested with a much larger sample, and deviations from it can be used to constrain the abundance of planets in the bulge relative to the disk.</P>
Transits and starspots in the WASP-6 planetary system
Tregloan-Reed, J.,Southworth, J.,Burgdorf, M.,Novati, S. C.,Dominik, M.,Finet, F.,Jorgensen, U. G.,Maier, G.,Mancini, L.,Prof, S.,Ricci, D.,Snodgrass, C.,Bozza, V.,Browne, P.,Dodds, P.,Gerner, T.,Harp Oxford University Press 2015 Monthly notices of the Royal Astronomical Society Vol.450 No.2
KMT-2018-BLG-0029LB: A VERY LOW MASS-RATIO Spitzer MICROLENS PLANET
Andrew Gould,류윤현,Sebastiano Calchi Novati,Weicheng Zang,Michael D. Albrow,정선주,CHEONGHOHAN,황규하,정연길,신인구,Yossi Shvartzvald,Jennifer C. Yee,차상목,Dong-Jin Kim,김현우,김승리,이정욱,Dong-Joo Lee,이용석,Byeong-Gon Park,Ri 한국천문학회 2020 Journal of The Korean Astronomical Society Vol.53 No.1
At q = 1.81+/-0.20*10^{-5}, KMT-2018-BLG-0029Lb has the lowest planet-host mass ratio q of any microlensing planet to date by more than a factor of two. Hence, it is the first planet that probes below the apparent "pile-up" at q = 5-10*10^{-5}. The event was observed by Spitzer, yielding a microlens-parallax pi_E measurement. Combined with a measurement of the Einstein radius theta_E from finite-source effects during the caustic crossings, these measurements imply masses of the host M_host = 1.14+0.10-0.12 M_sun and planet M_planet = 7.59+0.75-0.69 M_Earth, system distance D_L = 3.38+0.22-0.26 kpc and projected separation a_p = 4.27+0.21-0.23 au. The blended light, which is substantially brighter than the microlensed source, is plausibly due to the lens and could be observed at high resolution immediately.
An Isolated Microlens Observed from <i>K2</i> , <i>Spitzer</i> , and Earth
Zhu, Wei,Udalski, A.,Huang, C. X.,Novati, S. Calchi,Sumi, T.,Poleski, R.,Skowron, J.,Mró,z, P.,Szymań,ski, M. K.,Soszyń,ski, I.,Pietrukowicz, P.,Kozłowski, S.,Ulaczyk, K.,Pawlak, M.,Be American Astronomical Society 2017 ASTROPHYSICAL JOURNAL LETTERS - Vol.849 No.2
<i>SPITZER</i>PARALLAX OF OGLE-2015-BLG-0966: A COLD NEPTUNE IN THE GALACTIC DISK
Street, R. A.,Udalski, A.,Novati, S. Calchi,Hundertmark, M. P. G.,Zhu, W.,Gould, A.,Yee, J.,Tsapras, Y.,Bennett, D. P.,Jørgensen, U. G.,Dominik, M.,Andersen, M. I.,Bachelet, E.,Bozza, V.,Bramich, D. M American Astronomical Society 2016 The Astrophysical journal Vol.819 No.2
<P>We report the detection of a cold Neptune m(planet) = 21 +/- 2M(circle plus) orbiting a 0.38M(circle dot) M dwarf lying 2.5-3.3 kpc toward the Galactic center as part of a campaign combining ground-based and Spitzer observations to measure the Galactic distribution of planets. This is the first time that the complex real-time protocols described by Yee et al., which aim to maximize planet sensitivity while maintaining sample integrity, have been carried out in practice. Multiple survey and follow. up teams successfully combined their efforts within the framework of these protocols to detect this planet. This is the second planet in the Spitzer Galactic distribution sample. Both are in the near. to. mid-disk and are clearly not in the Galactic bulge.</P>
Physical properties of the WASP-67 planetary system from multi-colour photometry
Mancini, L.,Southworth, J.,Ciceri, S.,Calchi Novati, S.,Dominik, M.,Henning, Th.,Jørgensen, U. G.,Korhonen, H.,Nikolov, N.,Alsubai, K. A.,Bozza, V.,Bramich, D. M.,D’Ago, G.,Figuera Jaimes, R.,Galianni EDP Sciences 2014 Astronomy and astrophysics Vol.568 No.2
An Earth-mass Planet in a 1 au Orbit around an Ultracool Dwarf
Shvartzvald, Y.,Yee, J. C.,Novati, S. Calchi,Gould, A.,Lee, C.-U.,Beichman, C.,Bryden, G.,Carey, S.,Gaudi, B. S.,Henderson, C. B.,Zhu, W.,Albrow, M. D.,Cha, S.-M.,Chung, S.-J.,Han, C.,Hwang, K.-H.,Jun American Astronomical Society 2017 ASTROPHYSICAL JOURNAL LETTERS - Vol.840 No.1