I wanted the custom post type to show up on the regular author/search results page. Here's what I came up with in case anyone else is looking:

include-cpt-into.php

/*
 * I wanted the custom post type to show up on the regular author page. Here's what I came up with in case anyone else is looking:
 */
 add_filter('posts_where', 'include_for_author');
 function include_for_author($where){
     if(is_author())
         $where = str_replace(".post_type = 'post'", ".post_type in ('post', 'custom_post_type')", $where);

     return $where;
 }

 /*
  * I wanted the custom post type to show up on the regular search results page. Here's what I came up with in case anyone else is looking:
  */

 function filter_search($query) {
     if ($query->is_search) {
        $query->set('post_type', array('post', 'custom_post_type'));
     };
     return $query;
 };
 add_filter('pre_get_posts', 'filter_search');