Lightkurve

===================

- Significantly improved the performance of the ``PLDCorrector`` feature for
systematics removal. [470]

- Improved the normalization of the result returned by
``Periodogram.smooth(method='logmedian')``. [453]

- Improved the visualization of NaN values in ``TargetPixelFile.plot()``. [455]

- Various minor bug fixes. [448, 450, 463, 471]

===================

- The ``search_tesscut(...).download()`` feature now supports downloading
rectangular TESS FFI cut-outs. It previously only supported squares. [441]

- Fixed a bug which prevented ``search_tesscut(...).download_all()`` from
downloading all sectors. [440]

- Minor bug fixes and performance improvements. [439, 446]

===================

Changes
-------

- Simplified the installation of Lightkurve by turning several packages into
optional rather than required dependencies (``celerite``, ``pybind``,
``scikit-learn``, and ``bokeh``). [436]

- Added ``search_tesscut()``: an easy interface to access data produced using
the `MAST TESSCut service <https://mast.stsci.edu/tesscut/>`_. This service
extracts Target Pixel Files (TPFs) from TESS Full Frame Images (FFIs). [418]

- Added ``TargetPixelFile.interact_sky()``: an interactive Bokeh widget to
overlay Gaia DR2 source positions on top of TPFs. [124]

- Changed ``LightCurve.fold()``: the ``transit_midpoint`` parameter has been
deprecated in favor of the ``t0`` parameter. [419]

Bugfixes
--------

- Made ``BoxLeastSquaresPeriodogram`` robust against light curves that contain
NaNs. [432]

- ``TargetPixelFile.wcs`` now works for Target Pixel Files produced using the
MAST TessCut service. [434]

===================

- Introduced a new layout for the
`online documentation <https://docs.lightkurve.org>`_. [#360, 400, 406]

- Added ``LightCurve.interact_bls()``: an interactive Bokeh widget to find
planets using the Box Least Squares (BLS) method. [401]

- Added ``LombScarglePeriodogram`` and ``BoxLeastSquarePeriodogam`` sub-classes
to distinguish periodograms generated using different methods. [403]

- Added the ``PLDCorrector`` class to remove instrument systematics using the
Pixel Level Decorrelation (PLD) method. [305]

- Added the ``TargetPixelFile.to_corrector()`` convenience method to make
systematics correction classes easy to access. [305]

- Refactored ``SFFCorrector`` to make its API consistent with ``PLDCorrector``,
and deprecated the ``LightCurve.correct()`` method in favor of
``LightCurve.to_corrector()``. [408, 417]

- Made ``SFFCorrector`` robust against light curves that contain big gaps in
time. [414]

- Minor bug fixes. [392, 397, 420]

- Increased the unit test coverage. [387, 388]

===================

- The ``TargetPixelFile.interact()`` bokeh app now includes a ``Save Lightcurve``
button [329].

- Fixed a minor bug in ``LightCurve.bin()`` [377].

===================

- Added support for TESS to ``search_targetpixelfile()`` and
``search_lightcurvefile()`` [367].

- Added support for data generated by the
`TESScut service <https://mast.stsci.edu/tesscut/>`_ [#369, 375].

- Removed "Impulsive outliers" from the default set of quality constraints
applied to TESS data [374].

- ``LightCurve.flatten()`` is now more robust against outliers [372].

- ``LightCurve.fold()`` now takes a ``transit_midpoint`` parameter instead of
the ``phase`` parameter [361, 363].

- Various minor bugfixes [372].