No Clear, Direct Evidence for Multiple Protoplanets Orbiting LkCa 15: LkCa 15 
bcd are Likely Inner Disk Signals

Currie, Thayne; Marois, Christian; Cieza, Lucas; Mulders, Gijs D.; Lawson, Kellen; Caceres, Claudio; Rodriguez-Ruiz, Dary; Wisniewski, John; Guyon, Olivier; Brandt, Timothy D.; Kasdin, N. Jeremy; Groff, Tyler D.; Lozi, Julien; Chilcote, Jeffrey; Hodapp, Klaus; Jovanovic, Nemanja; Martinache, Frantz; Skaf, Nour; Lyra, Wladimir; Tamura, Motohide; Asensio-Torres, Ruben; Dong, Ruobing; Grady, Carol; Gerard, Benjamin; Fukagawa, Misato; Hand, Derek; Hayashi, Masahiko; Henning, Thomas; Kudo, Tomoyuki; Kuzuhara, Masayuki; Kwon, Jungmi; McElwain, Michael W.; Uyama, Taichi

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

No Clear, Direct Evidence for Multiple Protoplanets Orbiting LkCa 15: LkCa 15 bcd are Likely Inner Disk Signals

MPS-Authors

Currie, Thayne
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Marois, Christian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cieza, Lucas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mulders, Gijs D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lawson, Kellen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Caceres, Claudio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rodriguez-Ruiz, Dary
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wisniewski, John
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Guyon, Olivier
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Brandt, Timothy D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kasdin, N. Jeremy
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Groff, Tyler D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lozi, Julien
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chilcote, Jeffrey
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hodapp, Klaus
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jovanovic, Nemanja
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martinache, Frantz
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Skaf, Nour
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lyra, Wladimir
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tamura, Motohide
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Asensio-Torres, Ruben
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dong, Ruobing
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Grady, Carol
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gerard, Benjamin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fukagawa, Misato
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hand, Derek
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hayashi, Masahiko
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henning, Thomas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kudo, Tomoyuki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kuzuhara, Masayuki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kwon, Jungmi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

McElwain, Michael W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Uyama, Taichi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019ApJ...877L...3C
(Any fulltext)

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Currie, T., Marois, C., Cieza, L., Mulders, G. D., Lawson, K., Caceres, C., et al. (2019). No Clear, Direct Evidence for Multiple Protoplanets Orbiting LkCa 15: LkCa 15 bcd are Likely Inner Disk Signals. The Astrophysical Journal, 877.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D3C1-2

Abstract

Two studies utilizing sparse aperture-masking (SAM) interferometry and H_α differential imaging have reported multiple Jovian companions around the young solar-mass star, LkCa 15 (LkCa 15 bcd): the first claimed direct detection of infant, newly formed planets (“protoplanets”). We present new near-infrared direct imaging/spectroscopy from the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system coupled with Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS) integral field spectrograph and multi-epoch thermal infrared imaging from Keck/NIRC2 of LkCa 15 at high Strehl ratios. These data provide the first direct imaging look at the same wavelengths and in the same locations where previous studies identified the LkCa 15 protoplanets, and thus offer the first decisive test of their existence. The data do not reveal these planets. Instead, we resolve extended emission tracing a dust disk with a brightness and location comparable to that claimed for LkCa 15 bcd. Forward-models attributing this signal to orbiting planets are inconsistent with the combined SCExAO/CHARIS and Keck/NIRC2 data. An inner disk provides a more compelling explanation for the SAM detections and perhaps also the claimed H_α detection of LkCa 15 b. We conclude that there is currently no clear, direct evidence for multiple protoplanets orbiting LkCa 15, although the system likely contains at least one unseen Jovian companion. To identify Jovian companions around LkCa 15 from future observations, the inner disk should be detected and its effect modeled, removed, and shown to be distinguishable from planets. Protoplanet candidates identified from similar systems should likewise be clearly distinguished from disk emission through modeling.