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 & 38 others 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

Research output: Contribution to journalArticle

11 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)1-42
Number of pages42
JournalActa Astronomica
Volume68
Issue number1
DOIs
Publication statusPublished - 2018

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mass ratios
planets
turnover
planet
parallax
planet detection
snow
lenses
power law

Keywords

  • Gravitational lensing: micro
  • Planetary systems

Cite this

Udalski, A., Ryu, Y. H., Sajadian, S., Gould, A., Mróz, P., Poleski, R., ... 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
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. ; Jung, Y. K. ; Shin, I. G. ; Shvartzvald, Y. ; Yee, J. C. ; Zang, W. ; Zhu, W. ; Cha, S. M. ; Kim, D. J. ; Kim, H. W. ; Kim, S. L. ; Lee, C. U. ; Lee, D. J. ; Lee, Y. ; Park, B. G. ; Pogge, R. W. ; Bozza, V. ; Dominik, M. ; Helling, C. ; Hundertmark, M. ; Jørgensen, U. G. ; Longa-Peña, P. ; Lowry, S. ; Burgdorf, M. ; Campbell-White, J. ; Ciceri, S. ; Evans, D. ; Figuera Jaimes, R. ; Fujii, Y. I. ; Haikala, L. K. ; Henning, T. ; Hinse, T. C. ; Mancini, L. ; Peixinho, N. ; Rahvar, S. ; Rabus, M. ; Skottfelt, J. ; Snodgrass, C. ; Southworth, J. ; Von Essen, C. / OGLE-2017-BLG-1434Lb : Eighth q<1×10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function. In: Acta Astronomica. 2018 ; Vol. 68, No. 1. pp. 1-42.
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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",
issn = "0001-5237",
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

OGLE-2017-BLG-1434Lb : Eighth q<1×10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function. / 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.; Jung, Y. K.; Shin, I. G.; Shvartzvald, Y.; Yee, J. C.; Zang, W.; Zhu, W.; Cha, S. M.; Kim, D. J.; Kim, H. W.; Kim, S. L.; Lee, C. U.; Lee, D. J.; Lee, Y.; Park, B. G.; Pogge, R. W.; Bozza, V.; Dominik, M.; Helling, C.; Hundertmark, M.; Jørgensen, U. G.; Longa-Peña, P.; Lowry, S.; Burgdorf, M.; Campbell-White, J.; Ciceri, S.; Evans, D.; Figuera Jaimes, R.; Fujii, Y. I.; Haikala, L. K.; Henning, T.; Hinse, T. C.; Mancini, L.; Peixinho, N.; Rahvar, S.; Rabus, M.; Skottfelt, J.; Snodgrass, C.; Southworth, J.; Von Essen, C.

In: Acta Astronomica, Vol. 68, No. 1, 2018, p. 1-42.

Research output: Contribution to journalArticle

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

SN - 0001-5237

IS - 1

ER -