OGLE-2017-BLG-1434Lb: Eighth q<1×10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function

A. Udalski; Y. H. Ryu; S. Sajadian; A. Gould; P. Mróz; R. Poleski; M. K. Szymanski; J. Skowron; I. Soszynski; S. Kozlowski; P. Pietrukowicz; K. Ulaczyk; M. Pawlak; K. Rybicki; P. Iwanek; M. D. Albrow; S. J. Chung; C. Han; K. H. Hwang; Y. K. Jung; I. G. Shin; Y. Shvartzvald; J. C. Yee; W. Zang; W. Zhu; S. M. Cha; D. J. Kim; H. W. Kim; S. L. Kim; C. U. Lee; D. J. Lee; Y. Lee; B. G. Park; R. W. Pogge; V. Bozza; M. Dominik; C. Helling; M. Hundertmark; U. G. Jørgensen; P. Longa-Peña; S. Lowry; M. Burgdorf; J. Campbell-White; S. Ciceri; D. Evans; R. Figuera Jaimes; Y. I. Fujii; L. K. Haikala; T. Henning; T. C. Hinse; L. Mancini; N. Peixinho; S. Rahvar; M. Rabus; J. Skottfelt; C. Snodgrass; J. Southworth; C. Von Essen

doi:10.32023/0001-5237/68.1.1

OGLE-2017-BLG-1434Lb: Eighth q<1×10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function

A. Udalski, Y. H. Ryu, S. Sajadian, A. Gould, P. Mróz, R. Poleski, M. K. Szymanski, J. Skowron, I. Soszynski, S. Kozlowski, P. Pietrukowicz, K. Ulaczyk, M. Pawlak, K. Rybicki, P. Iwanek, M. D. Albrow, S. J. Chung, C. Han, K. H. Hwang, Y. K. JungI. G. Shin, Y. Shvartzvald, J. C. Yee, W. Zang, W. Zhu, S. M. Cha, D. J. Kim, H. W. Kim, S. L. Kim, C. U. Lee, D. J. Lee, Y. Lee, B. G. Park, R. W. Pogge, V. Bozza, M. Dominik, C. Helling, M. Hundertmark, U. G. Jørgensen, P. Longa-Peña, S. Lowry, M. Burgdorf, J. Campbell-White, S. Ciceri, D. Evans, R. Figuera Jaimes, Y. I. Fujii, L. K. Haikala, T. Henning, T. C. Hinse, L. Mancini, N. Peixinho, S. Rahvar, M. Rabus, J. Skottfelt, C. Snodgrass, J. Southworth, C. Von Essen

Physics

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Abstract

We report the discovery of a cold Super-Earth planet (m_p=4.4±0.5 M_⊕) orbiting a low-mass (M=0.23±0.03) M_☉ dwarf at projected separation a_⊥=1.18±0.10 a.u., i.e., about 1.9 times the distance the snow line. The system is quite nearby for a microlensing planet, D_L=0.86±0.09 kpc. Indeed, it was the large lens-source relative parallax π_rel=1.0 mas (combined with the low mass M) that gave rise to the large, and thus well-measured, "microlens parallax" π_E∝(π_rel/M)^1/2 that enabled these precise measurements. OGLE-2017-BLG-1434Lb is the eighth microlensing planet with planet-host mass ratio q<1×10^-4. We apply a new planet-detection sensitivity method, which is a variant of "V/V_max", to seven of these eight planets to derive the mass-ratio function in this regime. We find dN/d lnq ∝ q^p, with p=1.05^+0.78_-0.68, which confirms the "turnover" in the mass function found by Suzuki et al. relative to the power law of opposite sign n=-0.93±0.13 at higher mass ratios q≳2×10^-4. We combine our result with that of Suzuki et al. to obtain p=0.73^+0.42_-0.34.

Original language	English
Pages (from-to)	1-42
Number of pages	42
Journal	Acta Astronomica
Volume	68
Issue number	1
DOIs	https://doi.org/10.32023/0001-5237/68.1.1
Publication status	Published - 2018

Keywords

Gravitational lensing: micro
Planetary systems

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.32023/0001-5237/68.1.1

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Udalski, A., Ryu, Y. H., Sajadian, S., Gould, A., Mróz, P., Poleski, R., Szymanski, M. K., Skowron, J., Soszynski, I., Kozlowski, S., Pietrukowicz, P., Ulaczyk, K., Pawlak, M., Rybicki, K., Iwanek, P., Albrow, M. D., Chung, S. J., Han, C., Hwang, K. H., ... Von Essen, C. (2018). OGLE-2017-BLG-1434Lb: Eighth q<1×10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function. Acta Astronomica, 68(1), 1-42. https://doi.org/10.32023/0001-5237/68.1.1

@article{6ac9127694d2447bb1e596a5bcf08f1b,

title = "OGLE-2017-BLG-1434Lb: Eighth q<1×10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function",

abstract = "We report the discovery of a cold Super-Earth planet (mp=4.4±0.5 M⊕) orbiting a low-mass (M=0.23±0.03) M☉ dwarf at projected separation a⊥=1.18±0.10 a.u., i.e., about 1.9 times the distance the snow line. The system is quite nearby for a microlensing planet, DL=0.86±0.09 kpc. Indeed, it was the large lens-source relative parallax πrel=1.0 mas (combined with the low mass M) that gave rise to the large, and thus well-measured, {"}microlens parallax{"} πE∝(πrel/M)1/2 that enabled these precise measurements. OGLE-2017-BLG-1434Lb is the eighth microlensing planet with planet-host mass ratio q<1×10-4. We apply a new planet-detection sensitivity method, which is a variant of {"}V/Vmax{"}, to seven of these eight planets to derive the mass-ratio function in this regime. We find dN/d lnq ∝ qp, with p=1.05+0.78-0.68, which confirms the {"}turnover{"} in the mass function found by Suzuki et al. relative to the power law of opposite sign n=-0.93±0.13 at higher mass ratios q≳2×10-4. We combine our result with that of Suzuki et al. to obtain p=0.73+0.42-0.34.",

keywords = "Gravitational lensing: micro, Planetary systems",

author = "A. Udalski and Ryu, {Y. H.} and S. Sajadian and A. Gould and P. Mr{\'o}z and R. Poleski and Szymanski, {M. K.} and J. Skowron and I. Soszynski and S. Kozlowski and P. Pietrukowicz and K. Ulaczyk and M. Pawlak and K. Rybicki and P. Iwanek and Albrow, {M. D.} and Chung, {S. J.} and C. Han and Hwang, {K. H.} and Jung, {Y. K.} and Shin, {I. G.} and Y. Shvartzvald and Yee, {J. C.} and W. Zang and W. Zhu and Cha, {S. M.} and Kim, {D. J.} and Kim, {H. W.} and Kim, {S. L.} and Lee, {C. U.} and Lee, {D. J.} and Y. Lee and Park, {B. G.} and Pogge, {R. W.} and V. Bozza and M. Dominik and C. Helling and M. Hundertmark and J{\o}rgensen, {U. G.} and P. Longa-Pe{\~n}a and S. Lowry and M. Burgdorf and J. Campbell-White and S. Ciceri and D. Evans and {Figuera Jaimes}, R. and Fujii, {Y. I.} and Haikala, {L. K.} and T. Henning and Hinse, {T. C.} and L. Mancini and N. Peixinho and S. Rahvar and M. Rabus and J. Skottfelt and C. Snodgrass and J. Southworth and {Von Essen}, C.",

year = "2018",

doi = "10.32023/0001-5237/68.1.1",

language = "English",

volume = "68",

pages = "1--42",

journal = "Acta Astronomica",

publisher = "Copernicus Foundation for Polish Astronomy",

number = "1",

}

Udalski, A, Ryu, YH, Sajadian, S, Gould, A, Mróz, P, Poleski, R, Szymanski, MK, Skowron, J, Soszynski, I, Kozlowski, S, Pietrukowicz, P, Ulaczyk, K, Pawlak, M, Rybicki, K, Iwanek, P, Albrow, MD, Chung, SJ, Han, C, Hwang, KH, Jung, YK, Shin, IG, Shvartzvald, Y, Yee, JC, Zang, W, Zhu, W, Cha, SM, Kim, DJ, Kim, HW, Kim, SL, Lee, CU, Lee, DJ, Lee, Y, Park, BG, Pogge, RW, Bozza, V, Dominik, M, Helling, C, Hundertmark, M, Jørgensen, UG, Longa-Peña, P, Lowry, S, Burgdorf, M, Campbell-White, J, Ciceri, S, Evans, D, Figuera Jaimes, R, Fujii, YI, Haikala, LK, Henning, T, Hinse, TC, Mancini, L, Peixinho, N, Rahvar, S, Rabus, M, Skottfelt, J, Snodgrass, C, Southworth, J & Von Essen, C 2018, 'OGLE-2017-BLG-1434Lb: Eighth q<1×10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function', Acta Astronomica, vol. 68, no. 1, pp. 1-42. https://doi.org/10.32023/0001-5237/68.1.1

TY - JOUR

T1 - OGLE-2017-BLG-1434Lb

T2 - Eighth q<1×10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function

AU - Udalski, A.

AU - Ryu, Y. H.

AU - Sajadian, S.

AU - Gould, A.

AU - Mróz, P.

AU - Poleski, R.

AU - Szymanski, M. K.

AU - Skowron, J.

AU - Soszynski, I.

AU - Kozlowski, S.

AU - Pietrukowicz, P.

AU - Ulaczyk, K.

AU - Pawlak, M.

AU - Rybicki, K.

AU - Iwanek, P.

AU - Albrow, M. D.

AU - Chung, S. J.

AU - Han, C.

AU - Hwang, K. H.

AU - Jung, Y. K.

AU - Shin, I. G.

AU - Shvartzvald, Y.

AU - Yee, J. C.

AU - Zang, W.

AU - Zhu, W.

AU - Cha, S. M.

AU - Kim, D. J.

AU - Kim, H. W.

AU - Kim, S. L.

AU - Lee, C. U.

AU - Lee, D. J.

AU - Lee, Y.

AU - Park, B. G.

AU - Pogge, R. W.

AU - Bozza, V.

AU - Dominik, M.

AU - Helling, C.

AU - Hundertmark, M.

AU - Jørgensen, U. G.

AU - Longa-Peña, P.

AU - Lowry, S.

AU - Burgdorf, M.

AU - Campbell-White, J.

AU - Ciceri, S.

AU - Evans, D.

AU - Figuera Jaimes, R.

AU - Fujii, Y. I.

AU - Haikala, L. K.

AU - Henning, T.

AU - Hinse, T. C.

AU - Mancini, L.

AU - Peixinho, N.

AU - Rahvar, S.

AU - Rabus, M.

AU - Skottfelt, J.

AU - Snodgrass, C.

AU - Southworth, J.

AU - Von Essen, C.

PY - 2018

Y1 - 2018

N2 - We report the discovery of a cold Super-Earth planet (mp=4.4±0.5 M⊕) orbiting a low-mass (M=0.23±0.03) M☉ dwarf at projected separation a⊥=1.18±0.10 a.u., i.e., about 1.9 times the distance the snow line. The system is quite nearby for a microlensing planet, DL=0.86±0.09 kpc. Indeed, it was the large lens-source relative parallax πrel=1.0 mas (combined with the low mass M) that gave rise to the large, and thus well-measured, "microlens parallax" πE∝(πrel/M)1/2 that enabled these precise measurements. OGLE-2017-BLG-1434Lb is the eighth microlensing planet with planet-host mass ratio q<1×10-4. We apply a new planet-detection sensitivity method, which is a variant of "V/Vmax", to seven of these eight planets to derive the mass-ratio function in this regime. We find dN/d lnq ∝ qp, with p=1.05+0.78-0.68, which confirms the "turnover" in the mass function found by Suzuki et al. relative to the power law of opposite sign n=-0.93±0.13 at higher mass ratios q≳2×10-4. We combine our result with that of Suzuki et al. to obtain p=0.73+0.42-0.34.

AB - We report the discovery of a cold Super-Earth planet (mp=4.4±0.5 M⊕) orbiting a low-mass (M=0.23±0.03) M☉ dwarf at projected separation a⊥=1.18±0.10 a.u., i.e., about 1.9 times the distance the snow line. The system is quite nearby for a microlensing planet, DL=0.86±0.09 kpc. Indeed, it was the large lens-source relative parallax πrel=1.0 mas (combined with the low mass M) that gave rise to the large, and thus well-measured, "microlens parallax" πE∝(πrel/M)1/2 that enabled these precise measurements. OGLE-2017-BLG-1434Lb is the eighth microlensing planet with planet-host mass ratio q<1×10-4. We apply a new planet-detection sensitivity method, which is a variant of "V/Vmax", to seven of these eight planets to derive the mass-ratio function in this regime. We find dN/d lnq ∝ qp, with p=1.05+0.78-0.68, which confirms the "turnover" in the mass function found by Suzuki et al. relative to the power law of opposite sign n=-0.93±0.13 at higher mass ratios q≳2×10-4. We combine our result with that of Suzuki et al. to obtain p=0.73+0.42-0.34.

KW - Gravitational lensing: micro

KW - Planetary systems

UR - http://www.scopus.com/inward/record.url?scp=85045890524&partnerID=8YFLogxK

U2 - 10.32023/0001-5237/68.1.1

DO - 10.32023/0001-5237/68.1.1

M3 - Article

VL - 68

SP - 1

EP - 42

JO - Acta Astronomica

JF - Acta Astronomica

IS - 1

ER -

OGLE-2017-BLG-1434Lb: Eighth q<1×10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function

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