作者：G. M. Bernstein B. J. Holler R. Navarro-Escamilla P. H. Bernardinelli T. M. C. Abbott M. Aguena S. Allam O. Alves F. Andrade-Oliveira J. Annis D. Bacon D. Brooks D. L. Burke A. Carnero Rosell J. Carretero L. N. da Costa M. E. S. Pereira J. De Vicente S. Desai P. Doel A. Drlica-Wagner S. Everett I. Ferrero J. Frieman J. García-Bellido D. W. Gerdes D. Gruen G. Gutierrez K. Herner S. R. Hinton D. L. Hollowood K. Honscheid D. J. James K. Kuehn N. Kuropatkin J. L. Marshall J. Mena-Fernández R. Miquel R. L. C. Ogando A. Pieres A. A. Plazas Malagón M. Raveri K. Reil E. Sanchez I. Sevilla-Noarbe M. Smith M. Soares-Santos E. Suchyta M. E. C. Swanson P. Wiseman
我们结合了2015年在帕洛马60英寸望远镜上进行的为期6个月的活动、2018年哈勃太空望远镜WFC3活动中进行的为期1个月的Eris测光，以及2013-2018年的暗能量调查数据，确定了一条定义周期为15.771\pm 0.008$~天（1-$\sigma$形式不确定性）的光曲线，其形状接近正弦，峰间通量变化为3%。这以千分之一的精度与Dysonia绕Eris轨道的$P=15.78590\pm0.00005$~天周期相一致，加强了Szakats等人（2022）最近用独立数据对Eris同步旋转的检测。Gaia的测光与相同的光曲线一致。我们检测到，在冥王星和卡戎的亮度值之间，每度Eris的亮度有0.05\pm0.01$~mag的斜率。在Dynomia的亮度中检测到0.3$~ mag的变化，这似乎与同步期的双峰光曲线一致。Eris的同步自转是
We combine photometry of Eris from a 6-month campaign on the Palomar 60-inchtelescope in 2015, a 1-month Hubble Space Telescope WFC3 campaign in 2018, andDark Energy Survey data spanning 2013–2018 to determine a light curve ofdefinitive period $15.771\pm 0.008$~days (1-$\sigma$ formal uncertainties),with nearly sinusoidal shape and peak-to-peak flux variation of 3\%. This isconsistent at part-per-thousand precision with the $P=15.78590\pm0.00005$~dayperiod of Dysnomia’s orbit around Eris, strengthening the recent detection ofsynchronous rotation of Eris by Szakats et al (2022) with independent data.Photometry from Gaia is consistent with the same light curve. We detect a slopeof $0.05\pm0.01$~mag per degree of Eris’ brightness with respect toillumination phase, intermediate between Pluto’s and Charon’s values.Variations of $0.3$~mag are detected in Dysnomia’s brightness, plausiblyconsistent with a double-peaked light curve at the synchronous period. Thesynchronous rotation of Eris is consistent with simple tidal models initiatedwith a giant-impact origin of the binary, but is difficult to reconcile withgravitational capture of Dysnomia by Eris.
论文链接：http://arxiv.org/pdf/2303.13445v1
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